The average lengths of compact sedans and compact sport utility vehicles in America are 177.2 inches and 172.3 inches, respectively. Medium sedans and SUVs are 10 to 20 inches longer than their compact counterparts, while large cars are longer by a further 15 to 20 inches.
Modern vehicles have increased not only in length but also in width and in weight. According to a 2007 study by Edmunds.com, compact sedan cars were longer by 2 inches, wider by 2 inches, and heavier by 374 pounds on average than they were in 1997. The trend was also the same for medium and large cars.