The new 3.7L Ti-VCT V6 engine in the 2011 Ford Mustang is the most powerful production V6 ever in a Mustang.  And it offers up to 31 miles per gallon highway, making it the most fuel efficient in its class. EPA-estimated 19 city/31hwy/23 combined mpg. Coupe, available automatic transmission. Class is Sports Cars vs. 2010 competitors. 3.7l, 3.7l ti-vct v6, 2011, auto review, ford, ford mustang, ford mustang v6, fuel efficent, fuel efficiency automobiles, mpg, mustang, other motorsports, ti-vct v6, v6, v6 engine, Motorsports