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Are there standards for fuel economy as there are for emissions?

The Federal government regulates fuel economy by means of the Corporate Average Fuel Economy (CAFE) standards, which Congress periodically authorizes the Department of Transportation to set or adjust. There are separate standards for cars and trucks. The standards are for the average of the entire fleet for a given model year. A penalty is assessed if a manufacturer’s entire fleet of cars or trucks does not meet the average standard. Currently, the CAFE standards are 20.7 mpg for trucks and 27.5 mpg for cars.