GM Unwraps Plug-In Hybrid Volt as Buyers Warm to Trucks

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General Motors Co. unveiled a new version of its plug-in hybrid Chevrolet Volt as gas hovers near $2 a gallon and the number of buyers who want a fuel-sipping vehicle shrinks.

Cheap gas has been a boon for GM and its rivals for most of the past year, with sales of sport utility vehicles and pickups bringing fat profits to Detroit. Yet, it also underscores a problem. As GM and other automakers brag about new technology that will satisfy regulators and prepare for the future, consumers are more interested in SUVs these days.