The legality of that EPA rule, and another that imposes new restrictions on light-duty truck emissions, is currently being challenged through a number of law suits.

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When looking at SUTs, a category that would seem to offer a lot to those with light-duty truck needs but heavy-duty families, the Avalanche takes the high ground.

CNN: Chevy Avalanche: Big truck for the real world

Unlike the light-duty vehicle market, most medium- and heavy-duty truck purchasers operate on slim profit margins where fuel costs are a major factor in their economic survival.

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