V6 models provide ample power for everyday use. The supercharged version is muscular, as is the V8. GXP's TAPshift enhances performance more than similar systems, but the paddles are hard to reach with thumbs. Supercharged Grand Prixs GTs averaged 17.1-19.0 mpg in our tests. A GXP averaged 15.3. Pontiac recommends premium-grade fuel for these models, and 200-hp versions use regular. All Grand Prixs ride well. GT and GXP are the sportiest but never feel harsh. Base models are softer, with testers noting some float at highway speeds. Credit responsive steering and a wide front track for Grand Prix's composed, balanced handling. That wide track, though, contributes to a large turning radius, which hurts low-speed maneuverability. The brakes provide good stopping power despite numb pedal action. These sedans do a good job of quelling wind noise. The GXP's low-profile 18-inch tires slap on sharp pavement joints, but it compensates by offering a throaty but refined engine note. Grand Prix's interior pleases for its easy-to-use controls and ample front-seat leg room. That pleasure is quickly dulled by materials quality that trails rivals like the Honda Accord and even the upstart Hyundai Sonata. The rear seat also disappoints with its uncomfortably hard seatback and poor thigh support. Cargo space is about average for the class, but the available fold-flat front passenger seatback is helpful for hauling longer items.

Value for the Money
It trails our top-rated Honda Accord and Toyota Camry for interior quality, and rear-seat comfort is subpar. Still, Grand Prix appeals for its good performance, comfortable ride, cargo versatility, and plenty of features at competitive prices. The potent GXP is worth a look for shoppers who value power and expressive styling above all else.