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Weight

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In the United States, "from 1975 to 1980, average [car] weight dropped from 1,842 to 1,464 kg (4,060 to 3,228 lb), likely in response to rising gasoline prices" and new fuel efficiency standards. The average new car weighed 1,461 kg (3,221 lb) in 1987 but 1,818 kg (4,009 lb) in 2010, due to modern steel safety cages, anti-lock brakes, airbags, and "more-powerful—if more-efficient—engines." Heavier cars are safer for the driver from a crash perspective, but more dangerous for other vehicles and road users. The weight of a car influences fuel consumption and performance, with more weight resulting in increased fuel consumption and decreased performance. The SmartFortwo, a small city car, weighs 750–795 kg (1,655–1,755 lb). Heavier cars include full-size cars, SUVs and extended-length SUVs like the Suburban. 
According to research conducted by Julian Allwood of the University of Cambridge, global energy use could be greatly reduced by using lighter cars, and an average weight of 500 kg (1,100 lb) has been said to be well achievable. In some competitions such as the Shell Eco Marathon, average car weights of 45 kg (99 lb) have also been achieved. These cars are only single-seaters (still falling within the definition of a car, although 4-seater cars are more common), but they nevertheless demonstrate the amount by which car weights could still be reduced, and the subsequent lower fuel use (i.e. up to a fuel use of 2560 km/l).

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