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64-707: When it was introduced in 2002, it used a C32B V6 sourced from a Honda NSX tuned by Toda Racing ; this engine would be bored and stroked to 3.4 L similar to the NSXs running in GT500 at the time. The RD320R uses a Hewland 6-speed manual transmission actuated through a shift lever. More powerful versions intended for GT500 competition, the RD350R and RD408R , were developed in 2003 and 2004 respectively; these featured larger V8 engines for increased power. These cars competed without success in GT500 but were somewhat competitive in

128-415: A full-size SUV usually travels 13 mpg (US) (18 L/100 km) city and 16 mpg (US) (15 L/100 km) highway. Pickup trucks vary considerably; whereas a 4 cylinder-engined light pickup can achieve 28 mpg (8 L/100 km), a V8 full-size pickup with extended cabin only travels 13 mpg (US) (18 L/100 km) city and 15 mpg (US) (15 L/100 km) highway. The average fuel economy for all vehicles on

192-412: A variable length intake manifold , producing up to 132 kW (179 PS; 177 bhp) Applications; non-North America: Applications; North America: The DOHC VTEC C30A is a 2,977 cc (3.0 L) version, producing 270 bhp (274 PS; 201 kW) at 7,300 rpm and 284 N⋅m; 210 lbf⋅ft (29 kg⋅m) of torque at 6,500 rpm, with a 10.2:1 compression ratio. The engine has

256-593: A 4-speed automatic transmission, Honda used a slightly less powerful version of the C30A, with less aggressive cam timing and producing 252 bhp (188 kW; 255 PS). Though never mass produced, a heavily upgraded version of the engine was briefly used in GT-spec NSXs for the 2004 JGTC racing series by the Team Honda Racing satellite team . This engine was extensively modified by Mugen and

320-468: A 90-degree V-angle from bank to bank, common cylinder block bore centers, and four valves per cylinder. It is an all-aluminum design, and uses timing belt-driven single or dual overhead camshafts; the water pump is also driven by the timing belt. All C engines use an interference design; if the timing belt fails, any open valves will clash into the pistons, and severe engine damage will occur. The engine family can be broken down into three sub families: As

384-485: A bore and stroke of 90mm x 78mm, making the engine highly over square, which facilitates a shift in power to the higher end of the rpm range. It utilizes a crankshaft with offset crankpins to achieve an evenly spaced firing interval of 120°, something typically unattainable with a 90° cylinder bank angle. Honda selected the 90° V6 as the NSX's optimal engine choice, striking a balance between packaging, complexity, and lowering

448-673: A clear way as described in the UK Statutory Instrument 2004 No 1661. Since September 2005 a color-coded "Green Rating" sticker has been available in the UK, which rates fuel economy by CO 2 emissions: A: <= 100 g/km, B: 100–120, C: 121–150, D: 151–165, E: 166–185, F: 186–225, and G: 226+. Depending on the type of fuel used, for gasoline A corresponds to about 4.1 L/100 km (69 mpg ‑imp ; 57 mpg ‑US ) and G about 9.5 L/100 km (30 mpg ‑imp ; 25 mpg ‑US ). Ireland has

512-427: A cold start, and then "extra urban" travel at various speeds up to 120 km/h which follows the urban test. A combined figure is also quoted showing the total fuel consumed in divided by the total distance traveled in both tests. Fuel economy can be expressed in two ways: Conversions of units: While the thermal efficiency (mechanical output to chemical energy in fuel) of petroleum engines has increased since

576-533: A combined score of 16 or better is needed, so a car with a 10 for economy (greenhouse) and a 6 for emission or 6 for economy and 10 for emission, or anything in between would get the highest 5 star rating. The lowest rated car is the Ssangyong Korrando with automatic transmission, with one star, while the highest rated was the Toyota Prius hybrid. The Fiat 500, Fiat Punto and Fiat Ritmo as well as

640-550: A controlled laboratory testing procedure to generate the fuel consumption data that they submit to the Government of Canada. This controlled method of fuel consumption testing, including the use of standardized fuels, test cycles and calculations, is used instead of on-road driving to ensure that all vehicles are tested under identical conditions and that the results are consistent and repeatable. Selected test vehicles are "run in" for about 6,000 km before testing. The vehicle

704-404: A detailed analysis of the forces that oppose a vehicle's motion. In terms of physics, Force = rate at which the amount of work generated (energy delivered) varies with the distance traveled, or: Note: The amount of work generated by the vehicle's power source (energy delivered by the engine) would be exactly proportional to the amount of fuel energy consumed by the engine if the engine's efficiency

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768-465: A diesel-fueled car, and 5.0 L/100 km (47 mpg US , 56 mpg imp ) for a gasoline (petrol)-fueled car. The average consumption across the fleet is not immediately affected by the new vehicle fuel economy: for example, Australia's car fleet average in 2004 was 11.5 L/100 km (20.5 mpg US ), compared with the average new car consumption in the same year of 9.3 L/100 km (25.3 mpg US ) Fuel economy at steady speeds with selected vehicles

832-479: A general rule, interchange of parts will not work between these sub groups. SOHC 1,996 cc (2.0 L) Japan only; The variable length intake manifold used six individual small-bore intake runners below 3,500 rpm for each cylinder and added an additional six individual larger bore intake runners at higher RPMs. The C20AT was a turbocharged version, called the "Wing Turbo", producing 190 bhp (142 kW; 193 PS). Japan only: Honda replaced

896-580: A primary and a secondary intake plenum. Secondary intake plenum engages at 4800 RPM to improve engines breathing ability and broadens torque curve. The C30A also made use of titanium connecting rods , which was another first in a mass-production vehicle. The lightweight rods allowed a higher RPM to be achieved while maintaining the strength of traditional steel rods. The C30A block is an open-deck design made from an aluminum alloy with cylinders sleeved in ductile iron. The heads are 4 valves per cylinder (24 valves per engine total), twin-cam design and contain

960-399: A result of higher fuel cost. A study indicates that a 10% increase in gas prices will eventually produce a 2.04% increase in fuel economy. One method by car makers to increase fuel efficiency is lightweighting in which lighter-weight materials are substituted in for improved engine performance and handling. Identical vehicles can have varying fuel consumption figures listed depending upon

1024-600: A sticker on the windscreen showing the fuel consumption and the CO 2 emissions. Fuel consumption figures are expressed as urban , extra urban and combined , measured according to ECE Regulations 83 and 101 – which are the based on the European driving cycle ; previously, only the combined number was given. Australia also uses a star rating system, from one to five stars, that combines greenhouse gases with pollution, rating each from 0 to 10 with ten being best. To get 5 stars

1088-635: A top speed of 120 km/h (74.6 mph). EU fuel consumption numbers are often considerably lower than corresponding US EPA test results for the same vehicle. For example, the 2011 Honda CR-Z with a six-speed manual transmission is rated 6.1/4.4 L/100 km in Europe and 7.6/6.4 L/100 km (31/37 mpg ) in the United States. In the European Union advertising has to show carbon dioxide (CO 2 )-emission and fuel consumption data in

1152-546: A vacuum with frictionless wheels could travel at any speed without consuming any energy beyond what is needed to get the car up to speed. Less ideally, any vehicle must expend energy on overcoming road load forces, which consist of aerodynamic drag, tire rolling resistance, and inertial energy that is lost when the vehicle is decelerated by friction brakes. With ideal regenerative braking , the inertial energy could be completely recovered, but there are few options for reducing aerodynamic drag or rolling resistance other than optimizing

1216-474: Is 235.215 x {\displaystyle \textstyle {\frac {235.215}{x}}} , where x {\displaystyle x} is value of L/100 km. For miles per Imperial gallon (4.5461 L) the formula is 282.481 x {\displaystyle \textstyle {\frac {282.481}{x}}} . In parts of Europe, the two standard measuring cycles for "litre/100 km" value are "urban" traffic with speeds up to 50 km/h from

1280-427: Is 25% more miles per gallon for an efficient turbodiesel. For example, the current model Skoda Octavia, using Volkswagen engines, has a combined European fuel efficiency of 41.3 mpg ‑US (5.70 L/100 km) for the 105 bhp (78 kW) petrol engine and 52.3 mpg ‑US (4.50 L/100 km) for the 105 bhp (78 kW) — and heavier — diesel engine. The higher compression ratio

1344-542: Is a highly tuned DOHC V6 used in the Honda NSX , which produces 290 bhp (294 PS; 216 kW) at 7,100 rpm and 304 N⋅m; 224 lbf⋅ft (31 kg⋅m) at 5,500 rpm of torque , retaining the 10.2:1 compression ratio from the C30A. The engine is essentially an update to the C30A and does not share commonality with the C32A. Honda increased displacement to 3,179 cc (3.2 L; 194.0 cu in) through

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1408-534: Is helpful in raising the energy efficiency, but diesel fuel also contains approximately 10% more energy per unit volume than gasoline which contributes to the reduced fuel consumption for a given power output. In 2002, the United States had 85,174,776 trucks, and averaged 13.5 miles per US gallon (17.4 L/100 km; 16.2 mpg ‑imp ). Large trucks, over 33,000 pounds (15,000 kg), averaged 5.7 miles per US gallon (41 L/100 km; 6.8 mpg ‑imp ). The average economy of automobiles in

1472-815: Is produced by Daimler AG and is only sold by one company in the United States. Furthermore, the world record in fuel economy of production cars is held by the Volkswagen Group , with special production models (labeled "3L") of the Volkswagen Lupo and the Audi A2 , consuming as little as 3 L/100 km (94 mpg ‑imp ; 78 mpg ‑US ). Diesel engines generally achieve greater fuel efficiency than petrol (gasoline) engines. Passenger car diesel engines have energy efficiency of up to 41% but more typically 30%, and petrol engines of up to 37.3%, but more typically 20%. A common margin

1536-421: Is the same regardless of power output, but this is not necessarily the case due to the operating characteristics of the internal combustion engine. For a vehicle whose source of power is a heat engine (an engine that uses heat to perform useful work), the amount of fuel energy that a vehicle consumes per unit of distance (level road) depends upon: Ideally, a car traveling at a constant velocity on level ground in

1600-428: Is then mounted on a chassis dynamometer programmed to take into account the aerodynamic efficiency, weight and rolling resistance of the vehicle. A trained driver runs the vehicle through standardized driving cycles that simulate trips in the city and on the highway. Fuel consumption ratings are derived from the emissions generated during the driving cycles. THE 5 CYCLE TEST: Tests 1, 3, 4, and 5 are averaged to create

1664-455: The cylinder bores are lined with cast iron . The exhaust system uses equal length exhaust pipes connected to the Exhaust manifold to minimize scavenging resistance and maximum total exhaust efficiency. An external high capacity water cooled oil cooler and filter maintain an efficient oil temperature. The SOHC C27A is a 2.7 L version, with the major upgrade being the addition of

1728-654: The 2.7 L (2,675 cc) naturally aspirated V6 was too much for most, so the car disappeared. This was one of the only production Hondas ever turbocharged from the factory (excluding turbo engines of kei car for the Japan domestic market), along with the K23A1 straight-4 engine used in the Acura RDX and the ER straight-4 engine used in the first generation Honda City until model year 2017, when most of their model lines had

1792-432: The C30A. Applications: The C35A is a SOHC and carries the largest displacement of the C series at 3,473 cc (3.5 L; 211.9 cu in). The C35A was the first mass-produced engine to use block forged connecting rods contributing to precise balancing and an exceptionally strong bottom end. The C35 also contains a balance shaft to dampen engine vibrations associated with 90 degree design V6 engines. Besides

1856-515: The Citroen C3 also received 5 stars. The greenhouse rating depends on the fuel economy and the type of fuel used. A greenhouse rating of 10 requires 60 or less grams of CO 2 per km, while a rating of zero is more than 440 g/km CO 2 . The highest greenhouse rating of any 2009 car listed is the Toyota Prius, with 106 g/km CO 2 and 4.4 L/100 km (64 mpg ‑imp ; 53 mpg ‑US ). Several other cars also received

1920-604: The GT300 fields they were ultimately relegated to. At least one road car, known as the RD320 , was built. It was given the registration plate of EX02 OME. The RD320R was first introduced by R&D Sport in 2002 at the Fuji 500 km, the second round of the season, replacing one of their Porsche 911 GT3s . The RD320R dominated the season, achieving a pole position and winning its debut race and scoring three wins in total, although it lost

1984-629: The NMSL, accounted for 9.5% of the U.S' vehicle-miles-traveled in 1973, but such free-flowing roads typically provide more fuel-efficient travel than conventional roads. A reasonably modern European supermini and many mid-size cars, including station wagons, may manage motorway travel at 5 L/100 km (47 mpg US/56 mpg imp) or 6.5 L/100 km in city traffic (36 mpg US/43 mpg imp), with carbon dioxide emissions of around 140 g/km. An average North American mid-size car travels 21 mpg (US) (11 L/100 km) city, 27 mpg (US) (9 L/100 km) highway;

Vemac RD320R - Misplaced Pages Continue

2048-1047: The Netherlands. When the US National Maximum Speed Law 's 55 mph (89 km/h) speed limit was mandated from 1974 to 1995, there were complaints that fuel economy could decrease instead of increase. The 1997 Toyota Celica got better fuel-efficiency at 105 km/h (65 mph) than it did at 65 km/h (40 mph) (5.41 L/100 km (43.5 mpg ‑US ) vs 5.53 L/100 km (42.5 mpg ‑US )), although even better at 60 mph (97 km/h) than at 65 mph (105 km/h) (48.4 mpg ‑US (4.86 L/100 km) vs 43.5 mpg ‑US (5.41 L/100 km)), and its best economy (52.6 mpg ‑US (4.47 L/100 km)) at only 25 mph (40 km/h). Other vehicles tested had from 1.4 to 20.2% better fuel-efficiency at 90 km/h (56 mph) vs. 105 km/h (65 mph). Their best economy

2112-581: The RD320R was the Motegi GT race in 2011, with a sole RD320R driven by Team Mach; the team would replace their RD320R with a Ferrari 458 Italia GT3 . After the Super GT rule changes in 2012 that prohibited low-volume production cars from entering races, the RD320R (and likewise all other Vemacs) is no longer able to race in the series. An ex-Avanzza Rosso car, chassis number SVCRD320R03H0005, was imported into

2176-647: The USA. Most European vehicles cited in the CSI study run on diesel engines, which tend to achieve greater fuel efficiency than gas engines. Selling those cars in the United States is difficult because of emission standards, notes Walter McManus, a fuel economy expert at the University of Michigan Transportation Research Institute. "For the most part, European diesels don’t meet U.S. emission standards", McManus said in 2007. Another reason why many European models are not marketed in

2240-437: The United States in 2002 was 22.0 miles per US gallon (10.7 L/100 km; 26.4 mpg ‑imp ). By 2010 this had increased to 23.0 miles per US gallon (10.2 L/100 km; 27.6 mpg ‑imp ). Average fuel economy in the United States gradually declined until 1973, when it reached a low of 13.4 miles per US gallon (17.6 L/100 km; 16.1 mpg ‑imp ) and gradually has increased since, as

2304-541: The United States in 2018 and is currently being restored by a private collector. Honda C engine Honda 's first production V6 was the C series; it was produced in displacements from 2.0 to 3.5 liters. The C engine was produced in various forms for over 20 years (1985–2005), having first been used in the KA series Legend model, and its British sister car the Rover 800-series (and Sterling ). All C engines share in common

2368-408: The United States is that labor unions object to having the big 3 import any new foreign built models regardless of fuel economy while laying off workers at home. An example of European cars' capabilities of fuel economy is the microcar Smart Fortwo cdi, which can achieve up to 3.4 L/100 km (69.2 mpg US) using a turbocharged three-cylinder 41 bhp (30 kW) Diesel engine. The Fortwo

2432-515: The United States was 25.4 miles per US gallon (9.3 L/100 km). 2019 model year cars (ex. EVs) classified as "midsize" by the US EPA ranged from 12 to 56 mpg US (20 to 4.2 L/100 km) However, due to environmental concerns caused by CO 2 emissions, new EU regulations are being introduced to reduce the average emissions of cars sold beginning in 2012, to 130 g/km of CO 2 , equivalent to 4.5 L/100 km (52 mpg US , 63 mpg imp ) for

2496-511: The VTEC mechanism, which is actuated by oil pressure. For maximum performance, the C30A uses a direct ignition system, with individual ignition coils positioned directly over each cylinder spark plug . With its DOHC layout and its lightweight rotating assembly, the C30A is capable of reliable high RPM operation, but due to its complexity, cost, and use of exotic materials, the C30A was used exclusively on Honda's NSX car. For NSXs equipped with

2560-471: The addition of these forged components, the overall design is similar to its smaller counterpart the C32A, with some parts being interchangeable. The 9.6:1 compression ratio of the C32A is also retained, despite the increase in displacement. Applications: The C35B (name unconfirmed) is a DOHC V6 with VTEC which shares basic design properties with its SOHC non- VTEC counterpart but with more aggressive camshafts and slightly lighter cylinder walls. This

2624-540: The beginning of the automotive era , this is not the only factor in fuel economy. The design of automobile as a whole and usage pattern affects the fuel economy. Published fuel economy is subject to variation between jurisdiction due to variations in testing protocols. One of the first studies to determine fuel economy in the United States was the Mobil Economy Run , which was an event that took place every year from 1936 (except during World War II ) to 1968. It

Vemac RD320R - Misplaced Pages Continue

2688-502: The car's center of gravity . The engine was the second Honda engine ever to utilize Honda's proprietary VTEC variable valve timing system in an automotive application after the B16A, which adjusts cam lift depending on engine RPM and throttle position. VTEC allows the C30A to produce a high maximum power level while maintaining a relatively flat torque curve. C30A was also equipped with Variable Volume Induction System (VVIS) , which used

2752-461: The championship to the Toyota MR-S of Autobacs Racing Team Aguri due to various balance of performance adjustments. Other teams, notably Team Mach , Team LeyJun and Direxiv Motorsports , a small team with Formula One aspirations, would also compete with the RD320R. Team Mach's RD320R was notable in that it used an engine sourced from a Porsche 911 GT3 starting in 2009. The last race for

2816-448: The city driving fuel consumption rate. Tests 2, 4, and 5 are averaged to create the highway driving fuel consumption rate. In the European Union, passenger vehicles are commonly tested using two drive cycles, and corresponding fuel economies are reported as "urban" and "extra-urban", in liters per 100 km and (in the UK) in miles per imperial gallon. The urban economy is measured using

2880-493: The distance traveled per unit volume of fuel consumed. Since fuel consumption of vehicles is a significant factor in air pollution, and since the importation of motor fuel can be a large part of a nation's foreign trade , many countries impose requirements for fuel economy. Different methods are used to approximate the actual performance of the vehicle. The energy in fuel is required to overcome various losses ( wind resistance , tire drag , and others) encountered while propelling

2944-496: The impact that tire pressures have on the fuel efficiency. Environmental management systems EMAS , as well as good fleet management, includes record-keeping of the fleet fuel consumption. Quality management uses those figures to steer the measures acting on the fleets. This is a way to check whether procurement, driving, and maintenance in total have contributed to changes in the fleet's overall consumption. * highway ** combined From October 2008, all new cars had to be sold with

3008-963: The market, include: Many aftermarket consumer products exist that are purported to increase fuel economy; many of these claims have been discredited. In the United States, the Environmental Protection Agency maintains a list of devices that have been tested by independent laboratories and makes the test results available to the public. Governments, various environmentalist organizations, and companies like Toyota and Shell Oil Company have historically urged drivers to maintain adequate air pressure in tires and careful acceleration/deceleration habits. Keeping track of fuel efficiency stimulates fuel economy-maximizing behavior. A five-year partnership between Michelin and Anglian Water shows that 60,000 liters of fuel can be saved on tire pressure. The Anglian Water fleet of 4,000 vans and cars are now lasting their full lifetime. This shows

3072-499: The option of the 1.5L turbocharged engine. SOHC (2.5 L) V6 24 valves, 9.0:1 compression Japan North America: The engine utilized a 90 degree V-angle to the crankshaft in preference to the taller but more common 60 degree design, with a compression ratio of 9.0:1. The crankshaft had crankpins offset 30 degrees to provide a low profile engine that fires smoothly and evenly. The block and cross flow pent roof cylinder heads with 24 valves are die-cast from aluminum alloy and

3136-484: The road is higher in Europe than the United States because the higher cost of fuel changes consumer behaviour . In the UK, a gallon of gas without tax would cost US$ 1.97, but with taxes cost US$ 6.06 in 2005. The average cost in the United States was US$ 2.61. European-built cars are generally more fuel-efficient than US vehicles. While Europe has many higher efficiency diesel cars, European gasoline vehicles are on average also more efficient than gasoline-powered vehicles in

3200-489: The same rating of 8.5 for greenhouse. The lowest rated was the Ferrari 575 at 499 g/km CO 2 and 21.8 L/100 km (13.0 mpg ‑imp ; 10.8 mpg ‑US ). The Bentley also received a zero rating, at 465 g/km CO 2 . The best fuel economy of any year is the 2004–2005 Honda Insight , at 3.4 L/100 km (83 mpg ‑imp ; 69 mpg ‑US ). Vehicle manufacturers follow

3264-520: The sources of energy loss in moving a vehicle may be summarized as follows: Fuel-efficiency decreases from electrical loads are most pronounced at lower speeds because most electrical loads are constant while engine load increases with speed. So at a lower speed, a higher proportion of engine horsepower is used by electrical loads. Hybrid cars see the greatest effect on fuel-efficiency from electrical loads because of this proportional effect. Technologies that may improve fuel efficiency, but are not yet on

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3328-437: The test cycle known as ECE-15, first introduced in 1970 by EC Directive 70/220/EWG and finalized by EEC Directive 90/C81/01 in 1999. It simulates a 4,052 m (2.518 mile) urban trip at an average speed of 18.7 km/h (11.6 mph) and at a maximum speed of 50 km/h (31 mph). The extra-urban driving cycle or EUDC lasts 400 seconds (6 minutes 40 seconds) at an average speed 62.6 km/h (39 mph) and

3392-446: The testing methods of the jurisdiction. Lexus IS 250 – petrol 2.5 L 4GR-FSE V6 , 204 hp (153 kW), 6 speed automatic, rear wheel drive Since the total force opposing the vehicle's motion (at constant speed) multiplied by the distance through which the vehicle travels represents the work that the vehicle's engine must perform, the study of fuel economy (the amount of energy consumed per unit of distance traveled) requires

3456-643: The use of larger 93 mm (3.66 in) pistons over the 90 mm (3.54 in) used in the C30A, while leaving the 78 mm (3.07 in) stroke the same. To accommodate the larger pistons, Honda used an advanced metallurgical technique on the cylinders called Fiber Reinforced Metal (FRM), in which an ultra lightweight alumina-carbon fiber is cast into the traditional aluminum alloy for enhanced rigidity. This process allowed thinner cylinder walls to be used while providing acceptable cooling characteristics. The C32B also used 36 mm (1.4 in) intake valves, which are 1 mm (0.04 in) larger than those in

3520-617: The variable length intake manifold with a variable geometry turbocharger to the C20A engine used in the Japanese Domestic Market Legend. The turbo with intercooler -equipped engine was the C20AT engine and are extremely rare. Honda pioneered variable-geometry turbo chargers. The "Wing Turbo", as Honda called them, were controlled by an 8-bit processor ECU and they were constantly adjusting. Basically, at low speeds

3584-416: The vehicle's shape and the tire design. Road load energy or the energy demanded at the wheels, can be calculated by evaluating the vehicle equation of motion over a specific driving cycle. The vehicle powertrain must then provide this minimum energy to move the vehicle and will lose a large amount of additional energy in the process of converting fuel energy into work and transmitting it to the wheels. Overall,

3648-728: The vehicle, and in providing power to vehicle systems such as ignition or air conditioning. Various strategies can be employed to reduce losses at each of the conversions between the chemical energy in the fuel and the kinetic energy of the vehicle. Driver behavior can affect fuel economy; maneuvers such as sudden acceleration and heavy braking waste energy. Electric cars do not directly burn fuel, and so do not have fuel economy per se, but equivalence measures, such as miles per gallon gasoline equivalent have been created to attempt to compare them. The fuel efficiency of motor vehicles can be expressed in multiple ways: The formula for converting to miles per US gallon (3.7854 L) from L/100 km

3712-401: The wings surrounding the turbine wheel inside the compressor housing on the intake side would be nearly closed to speed and direct exhaust pressure precisely on the turbine wheel. At 2000 rpm, the wings would fluctuate and it would act like a much larger turbo to increase fuel economy as needed. This car was quick and powerful, but the price premium over the slightly longer and wider Legend with

3776-621: Was designed to provide real, efficient fuel efficiency numbers during a coast-to-coast test on real roads and with regular traffic and weather conditions. The Mobil Oil Corporation sponsored it and the United States Auto Club (USAC) sanctioned and operated the run. In more recent studies, the average fuel economy for new passenger car in the United States improved from 17 mpg (13.8 L/100 km) in 1978 to more than 22 mpg (10.7 L/100 km) in 1982. The average fuel economy for new 2020 model year cars, light trucks and SUVs in

3840-419: Was partly based on a belief that cars achieve maximum efficiency between 40 and 50 mph (65 and 80 km/h) and that trucks and buses were most efficient at 55 mph (89 km/h). In 1998, the U.S. Transportation Research Board footnoted an estimate that the 1974 National Maximum Speed Limit (NMSL) reduced fuel consumption by 0.2 to 1.0 percent. Rural interstates, the roads most visibly affected by

3904-399: Was reached at speeds of 40 to 90 km/h (25 to 56 mph) (see graph). Officials hoped that the 55 mph (89 km/h) limit, combined with a ban on ornamental lighting, no gasoline sales on Sunday, and a 15% cut in gasoline production, would reduce total gasoline consumption by 200,000 barrels a day, representing a 2.2% drop from annualized 1973 gasoline consumption levels. This

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3968-846: Was studied in 2010. The most recent study indicates greater fuel efficiency at higher speeds than earlier studies; for example, some vehicles achieve better fuel economy at 100 km/h (62 mph) rather than at 70 km/h (43 mph), although not their best economy, such as the 1994 Oldsmobile Cutlass Ciera with the LN2 2.2L engine, which has its best economy at 90 km/h (56 mph) (8.1 L/100 km (29 mpg ‑US )), and gets better economy at 105 km/h (65 mph) than at 72 km/h (45 mph) (9.4 L/100 km (25 mpg ‑US ) vs 22 mpg ‑US (11 L/100 km)). The proportion of driving on high speed roadways varies from 4% in Ireland to 41% in

4032-466: Was the first turbocharged Honda engine used in the series: prior GT-spec NSXs used a variant of the naturally aspirated C32B engine. Though the exact performance figures were kept secret, it is rumored to output more than 500 bhp (373 kW). Applications: The C32A is a 3,206 cc (3.2 L) version. The SOHC depending on model year, produces 200 hp (203 PS; 149 kW) or 230 hp (172 kW). Applications; The C32B

4096-471: Was the only DOHC VTEC V6 ever built by Honda for longitudinal applications and was only used in one non-production car, the Honda FS-X concept. Applications: Fuel economy in automobiles The fuel economy of an automobile relates to the distance traveled by a vehicle and the amount of fuel consumed . Consumption can be expressed in terms of the volume of fuel to travel a distance, or

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