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They bought them because they wanted big cars — and because gas was cheap. If gas stays cheap, Americans would be less inclined to squeeze their families into a lithe fuel-efficient alternative.

The recent infatuation with the Toyota Prius and other fuel-efficient cars could well come to a similar end. It took a gallon of gas at $4.10 to push the share of light trucks down to 45 percent in July. But as gasoline plummeted back to $1.60 a gallon, their share inched back up to 49 percent of auto sales in November.