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TAHOE, SUBURBAN

These full-sized SUVs were scheduled to be restyled and re-engineered for the 2012 model year, but plans were put on hold after gas prices soared last summer and truck sales dropped.

Several plans are being considered for the 2013 or 2014 model year. The Tahoe may be dropped or the next generation may be built on the lighter fwd Lambda platform used for the Traverse. The Suburban might survive by sharing the Silverado platform since the SUV is used for some commercial applications.

TRAVERSE

No major changes are planned through the 2012 model year.

VOLT

General Motors CEO Fritz Henderson said the plug-in hybrid is expected to get city fuel economy of at least 230 miles per gallon, or 25 kilowatt hours per 100 miles. The combined city/highway fuel economy rating for the Volt will be rated at over 100 mpg. That performance, based on fuel-economy methodology being developed for plug-in cars by the U.S. Environmental Protection Agency, would make the Volt the first mass-produced vehicle to achieve triple-digit fuel economy. Henderson said GM expects the Volt could be totally recharged for about 40 cents.

GM expects to produce roughly 60,000 first-generation Volts, which are scheduled to go on sale in November 2010 as 2011 models.

The Volt will share a fwd vehicle platform with the Cruze and Orlando and other GM vehicles.