The Ford Mustang holds the distinction of being the first "pony car"---a vehicle characterized by a long hood, short trunk and sporty performance bolstered by powerful engines. As of September 2010, the current model is the 2011 Mustang, and there are two trims available: the V-6 and the GT. Although both trims adhere to the Mustang tradition of high performance, the GT is placed higher than the V6 in this regard.
The 2011 Ford Mustang V6 is named after its engine: a 3.7-liter V-6. It produces 305 horsepower at 6,500 revolutions per minute (rpm) and 280 pounds-feet (lb-ft) of torque at 4,250 rpm. It also has a 227-cubic inch (cu. in) displacement, a bore and stroke of 95.5-by-86.7 millimeters (mm) and a 10.5-to-1 compression ratio. The GT trim of the 2011 Ford Mustang has a more powerful engine: a 5-liter V-8 engine. It generates 402 horsepower at 6,500 rpm and 377 lb-ft of torque at 4,250 rpm with regular fuel, and 412 horsepower at 6,500 rpm and 390 lb-ft of torque at 4,250 rpm with premium fuel. Its displacement is 302.15 cu.in, its bore and stroke is 92.2-by-92.7 mm, and its compression ratio is 11 to 1.
Mainly due to its engine, the GT trim of the 2011 Ford Mustang is a faster accelerator than its V6 counterpart. It can go from zero to 60 miles per hour (mph) in 4.8 seconds and cover a quarter-mile distance in 13 seconds at 110.6 miles per hour (mph). By comparison, the V6 trim can go from zero to 60 mph in 5.5 seconds and traverse a quarter-mile in 14 seconds.
Despite its less powerful engine, the V6 trim of the 2011 Ford Mustang is more fuel efficient than the GT. It gets a fuel economy of 19 miles per gallon (mpg) for city driving and 29 mpg for highway driving with a six-speed manual transmission. With a six-speed automatic gearbox, it gets a fuel economy of 19/31 mpg. For the GT, the fuel economy is 17/26 mpg with a manual transmission and 18/25 mpg with an automatic transmission.