Tl* the contact owns a 2011 chevrolet camaro. the contact stated that the owner's manual indicated that the manufacturer specification for the fuel economy was 18 mpg for city limit driving and 29 mpg for highway driving. the contact stated that the average mpg was actually 12.883. the manufacturer was notified and provided no further assistance. the approximate failure mileage was 400. updated 01/04/12*lj the consumer stated on november 25, 2011, the tank was 100% freeway miles which raised average. the freeway mpg should have been 29 mpg. which was consistent of 9 mpg less than it should have been getting. updated 01/05/12