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Car companies are looking at a variety of ways to get more miles out of a gallon, a bushel or a volt.
2008 GMC Yukon Hybrid
Two-mode hybrid
2008 GMC Yukon Hybrid
This will be the first General Motors vehicle with the company's new two-mode hybrid system, developed in conjunction with DaimlerChrysler and BMW.

The two-mode system is designed to operate at maximum efficiency in both city and highway driving, GM says. Most current hybrid systems improve efficiency the most in stop-and-go driving. That's why cars like the Toyota Prius have higher EPA fuel economy ratings for city driving than highway driving, just the reverse of most cars. GM promises a 25-percent improvement in overall fuel economy.

Another advantage of the two-mode system is that it is incorporated into the vehicle's transmission tunnel making it less expensive to produce hybrid versions of vehicles.


Flex-fuel

Clean diesel

Natural gas

Parallel hybrid

Two-mode hybrid

Hydrogen-
burning

Plug-in hybrid

Series hybrid

Fuel cell

Plug-in fuel cell

Turbine
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