2002 Pontiac Grand Prix GTP 4dr Sedan (3.8L 6cyl S/C 4A)
I get over 30 mpg on highway 24 in city. Hot foot wife does much worse. Outside of battery, brakes tires, and oil changes, have had NO repairs in first 140,000 miles. Needed to replace oil pan gasket but delayed it until now. Oil is still cheaper than the repair. Suddenly the motor mount went bad. (Supercharged models use one less mount) which caused front axle boot to go. While it was apart replaced water pump which was still OK. Wife loves the car, I'm a van person so I feel cramped in it but it is fun to drive and the boost is great when needed. Tried using premium fuel but saw no gain in hp or mpg so have used regular since then with no problem.