Price at about $590,000, the 2008 Saleen S7 Twin Turbo is a powerful mid-engine, rear-wheel-drive, and 2-passenger 2- door coupe that was designed to compete with the fastest and most powerful supercars. With an acceleration rate of 0-60mph in 2.8s, the 2008 Saleen S7 is one furious roadster. The projected fuel economy is 9mpg city and 15mpg highway.