The Pontiac G8 is a modern muscle car, with rear-wheel drive and a snarly V8. Under full-throttle acceleration, the new GXP model reminds us of a Corvette, pasting us into the back of the seat as a guttural roar comes from under the hood. In fact, the high-performance GXP is powered by a Corvette engine.
The G8 comes with a 256-hp V6, the same engine found in the brilliant Cadillac CTS. There's adequate power from the V6 engine. The base model lacks the verve of the GT model, however, partly because its five-speed automatic is less responsive. Still, it costs $3,400 less than the GT, and it delivers better fuel economy, earning an EPA rating of 17/25 mpg City/Highway.
The G8 GT features a 361-horsepower V8 that's smooth and responsive at any speed, and it makes for the most powerful sedan in this price range. Step on the gas: The thrill starts at the hood scoops, passes through the seat of the pants and spills from the GT's four stainless-steel exhaust tips as the countryside disappears rapidly in the rearview mirror. The GT's six-speed automatic is one of the smoothest, quickest shifting transmissions anywhere. Its handling character is taut, and its ride is comfortably firm. Thanks to GM's Active Fuel Management cylinder-deactivation technology, mileage isn't bad either, for such a powerful car. The GT delivers up to 24 mpg highway.
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