Sales of full-size sport-utility vehicles tumbled last month, and sales of some smaller, more fuel-efficient SUVs boomed in what could be a sign that higher fuel prices are hurting automakers’ high-profit models.

Even in big-truck capital Texas, fuel economy concerns are apparent. ’’We’re getting a lot of calls on the Escape hybrid, and it’s not even out yet,’’ says Jerry Reynolds at Prestige Ford in Garland, Texas.

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