After an interval of 37 years, the Shelby nameplate returned to Ford on some specially-equipped Mustangs in 2007. This year, the GT500 gets an engine update with an all-new 5.4 liter aluminum motor that is 102 pounds lighter than the previous cast-iron engine and produces 550 horsepower. Is this a muscle car for environmentalists? With an EPA rating of 15 mpg city, 23 mph highway, the Shelby avoids the gas-guzzler tax. At $48,310, the Shelby is $8,500 more than the 2012 Boss 302 Mustang, which takes three-tenths of a second longer to get to 60 mph.
All the market research, focus groups, and top engineering can't change one simple fact: Sometimes carmakers blow it. More
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