Turbo Four-Cylinder to be Offered in Future Aura? (Visit this link)
GM vice chairman Bob Lutz told Leftlane that such a model was under development at the 2008 New York Auto Show, and these photos appear to be confirmation. According to the car's wrap sheet, it's powered by a 260 horsepower engine and weighs about 300 pounds less than the Pontiac G8 GT. Despite the engine being in a car that is "seemingly way too big," Lutz says the engine "[feels] just great." The combination of the smaller displacement engine — which is a third of the size of the Pontiac GT's 6.0L V8 — and lighter curb weight could see the these sedans post fuel economy numbers in the low 30s.