With swan-wing doors, a shark-nose grille, and a supercar stance, the i8 plug-in hybrid is a truly revolutionary vehicle. The interior seats four in trappings worthy of a W Hotel. A turbocharged three-cylinder gas engine teams with two electric motors for a combined 357 hp; the i8 hits 60 mph faster than an M3. Top speed is 155 mph; fuel economy is less than 30 mpg—amazing for a supercar but not for a plug-in. Handling is agile, steering sharp; braking is great for any car, let alone a hybrid.