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Today's gas-electric hybrids, like the Toyota Prius, are the most fuel efficient and greenest cars on the road.

The best strategy for fuel efficiency is to downsize. And there are many stylish and sporty options.

The new generation of diesel vehicles offers lower emissions, high efficiency, and superior
performance.

A growing number of vehicles can run on an 85 percent blend of ethanol, but finding E85 vehicles can be tricky.

Several carmakers are planning to introduce 100+ mpg-hybrids that can be plugged into the electric grid. Expected around 2010.

This mild form of hybrid doesn't burn gas when it comes to a stop. That means about 10 percent better fuel efficiency.

Question internal combustion. EVs are on the way, but for now, expect limited size and range, or a big price tag.

Hydrogen-powered cars are slowly becoming a reality. Limited-production models are being offered to a handful of drivers.

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