Auto News 5

Americans have never been much for the metric system. We love our country miles and our cups of sugar, and we're happy to tell you what an ounce of prevention is worth. There's one metric measurement, however, that's as American as the ten-gallon hat, one that sets aflutter the hearts of Ford Mustang aficionados coast to coast: 5.0 liters - "five-oh" to the faithful. Cheekily rounded up from 4942 cubic centimeters, it's the engine displacement - denoted by an iconic emblem behind the front wheel arch - that defined Mustang performance for more than a decade, one so fundamental to the nameplate that Ford has brought it back to huge fanfare for 2011.