The Department of Energy says that having a hot booty isn't necessarily a good thing. In fact, it argues that ventilated seats (like those of the Cadillac STS that pull away warm air and moisture), could save as many as 522 million gallons of gas if all cars on the road were equipped with the technology. How so? The DOE reasons that if drivers' rumps and backsides are kept comfortable, fewer people would find it necessary to turn on the air-conditioning... thus saving money and the environment.

The catch? Vented seats generally only come on higher-end models, and are often high-cost options bundled in with other features.

[Source: Edmunds Inside Line]