GM Will Double its 40-MPG Vehicles by 2017 By Luke Vandezande Jul 11 2013 Share this Article Tweet Expect the number of fuel efficient vehicles offered by General Motors grow in the next four years. Continue Reading... Filed under: American Featured Articles GMTags: 2017, Buick, Chevrolet, co2 target, cruze, diesel, eco, Electric Cars, emissions, EVs, fuel efficiency, general motors, gm emissions goals, GMC, malibu, mpgs, Opel, vauxhall, volt