Enacted by Congress in 1975, the Corporate Average Fuel Economy (CAFE) program mandates that all manufacturers marketing vehicles in the United States meet average fuel economy requirements for each class of vehicles they sell. Each manufacturer's fleet must average 27.5 mpg for cars and 20.7 mpg for light trucks. Manufacturers are subject to a fine of $55 per truck when the average fuel economy of their fleet falls short of the CAFE light-truck standard by one mile per gallon.