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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Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer LIBOR Warning: Neither BBA Enterprises Limited, nor the BBA LIBOR Contributor Banks, nor Reuters, can be held liable for any irregularity or inaccuracy of BBA LIBOR. Disclaimer. Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.