With the price of gasoline constantly on the rise, we've become more and more interested in alternative fuels. Among those that have become most prevalent are E85 and propane. Many new cars and trucks ...

That classic car in the garage sure is a beauty. But it's not terribly fuel-efficient, and it's probably got minimal emissions controls. What's an eco-conscious gearhead to do? Convert it to propane.

Natural-gas cars sell only in tiny numbers to individual retail buyers, although they have found some traction with fleets that have ready access to the fuel. Now, those fleet buyers will get another ...