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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Most stock quote data provided by BATS. Market indices are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer.

Morningstar: © 2014 Morningstar, Inc. All Rights Reserved.

Factset: FactSet Research Systems Inc. 2014. All rights reserved.

Chicago Mercantile Association: Certain market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved.

Dow Jones: The Dow Jones branded indices are proprietary to and are calculated, distributed and marketed by DJI Opco, a subsidiary of S&P Dow Jones Indices LLC and have been licensed for use to S&P Opco, LLC and CNN. Standard & Poor's and S&P are registered trademarks of Standard & Poor’s Financial Services LLC and Dow Jones is a registered trademark of Dow Jones Trademark Holdings LLC. All content of the Dow Jones branded indices © S&P Dow Jones Indices LLC 2014 and/or its affiliates.