In 2017, about 46% of all new cars achieved 30 miles per gallon (mpg) or higher while the number of cars exceeding 50 mpg rose to about 5%. For light trucks, almost two-thirds achieved fuel economy above 20 mpg and less than one percent fell below 15 mpg. By contrast, in 1975, about 88% of new cars achieved less than 20 mpg and about 7% got less than 10 mpg. For new light trucks in 1975, nearly all (97.5%) were under 20 mpg and about 28% were under 10 mpg. Over the 42-year period there have been many advances in engine technologies, transmission technologies, aerodynamics, tires, and high-strength lightweight materials that have increased efficiency of light vehicles.
*Data for 2017 are preliminary, based on projected production