What Really Saves Gas? And How Much?

Automakers have been interested in aerodynamics at least since the introduction of the Chrysler Airflow in 1934. But the need to improve fuel economy in recent years has pushed aerodynamics toward the top of automakers' priority lists.

You may have read the tantalizing claims of additives, magnets or secret devices that will magically boost your gas mileage. And if you're like most people, you've been curious: Do these products actually work?

How Far Would You Go For the Planet? Part Two

Eco-Friendly Cars Are Ready for Prime Time. Are They a Pleasure or a Hassle

How Far Would You Go For the Planet? Part One

Diesel's Greener Bill of Health

Stretch Your Petro-Dollar Without Compromising Driving Enjoyment

Diesel, once long ignored like the ugly stepchild of the fossil fuel family, has worked its way out of the dirty dungeon and made it to the ball. As in the Cinderella fairy tale, diesel's fairy godmothers, the auto industry and oil companies, have transformed it from a grimy, smelly mess into a serious contender for Prince Charming's hand. More importantly, fuel-efficient diesel vehicles are now serious contenders for Americans' garages, as buyers seek out the most painless solutions to high gas prices that aren't going down anytime soon.

So you've researched the perfect hybrid or alternative-fuel vehicle, but it costs a good deal more than its conventionally powered cousin. There's good news, however, as the federal government offers large tax credits — up to $3,400 for hybrids and clean diesels, or $4,000 for alternative fuels — as incentives for Americans to reduce their gas dependency.