Billed as the successor the Seville, the Cadillac STS made its debut in 2005 to positive reviews. The full-size luxury sedan has 4 doors, seats 5, and comes in 3 trims: V6, V8, and V8 AWD. If you want the STS-V or AWD in your V6, look at the 2006 model year. As for gas mileage, you can expect to get 16 mpg in the city and 23 on the highway. All 3 trims have 4 doors, seat 5, and offer standard air conditioning, power windows, power door locks, leather seats, cd player, ABS brakes, traction control, and stability control. Sunroof, power seats, and navigation system come as options. In addition, the STS gives you plenty of room to stretch with 102.9 cubic feet of passenger space and 13.8 cubic feet of cargo space. Drivers like the STS' price, options, smooth handling, and powerful engine. While the interior materials don't quite match up with the imports, reviewers agree that the Cadillac STS acquitted itself well in its first year. Some even say that this luxury sedan may have begun to close the gap on Cadillac's foreign competition.