US / fuel economy standards Cars Must Get 35.7mpg by 2015 Feds toughen fuel standards by 25% By John Johnson, Newser Staff Posted Apr 22, 2008 9:03 PM CDT Copied Motorists pass a pair of gas stations in Mill Valley, Calif., Monday, April 21, 2008. (AP Photo/Eric Risberg) Cars will have to get 35.7 miles per gallon by 2015, and trucks will have to get 28.6 under new standards issued by the federal government today. That means a combined average of 31.6mpg, an increase of 25% from current standards, CNN reports. The feds require automakers to meet a combined 35mpg by 2020 under last year's energy bill, and today's standards are a step toward that goal. (More fuel economy standards stories.) Report an error