Most people know by now that hybrids use electricity to achieve good gas mileage, but how their advanced powertrains work and whether they help your pocketbook is a bit more complicated. Here we'll take a look at the basic technology and its variations. In a future article we'll discuss the cost, and potential savings, of owning a hybrid.

The 2008 Tahoe Hybrid, available in two- or four-wheel drive, provides the power and capability you expect from a utility vehicle while offering fuel efficiency you never imagined — an outstanding EPA estimated MPG of 21 city, 22 highway for 2WD models, and 20 city, 20 highway for 4x4. In fact, 2008 Tahoe Hybrid 2WD offers the same EPA estimated city fuel efficiency as a four-cylinder Toyota Camry

A company named Zero Pollution Motors says it plans to bring a car powered by air to the U.S. sometime in 2009 or 2010. The six pistons in the Air Car's engine are pushed by compressed air rather than gasoline combustion, an idea developed by F1 race car engineer Guy Negre.

SAN JOSE, Calif.--Silicon Valley is sparking a revolution in alternative-fuel autos, but it may take awhile--too long perhaps--to effect change in Detroit, according to a panel of auto executives.

Car Drive 40 Miles On Electric Power Alone"