One of the bewildering questions in the auto industry is how high gas prices would have to climb before Americans dump their gas guzzlers for more fuel-efficient cars. The issue comes to a head every time prices spike at the pump, whether because of turmoil in the Middle East, a lack of refinery capacity or old-fashioned opportunism in anticipation of a surge in demand. That's the scene now, with oil futures hitting record levels and gas prices averaging nearly $2 per gal. nationwide just as the summer driving season kicks off. If you just spent $75 to fill up your Chevy...
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