If the new 54.5 mpg fleet fuel economy standard is implemented, cars in 2025 will go twice as far on a gallon of gas as they do today. Not everyone is happy about the fuel economy hikes, however. The NADA is concerned that this measure could price more Americans out of car purchases by adding about $3,000 to the average cost of a car. Some opponents to the 54.5 mpg CAFE standard view small cars as unsafe.