Acorrding to a recent study:


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OTTAWA — Could it really be so - that GM's Hummer is more than 40 per cent greener than Toyota's Prius? That Ford's F-Series pickup is greener? That GM's Silverado pickup is greener? That Dodge's Ram pickup is greener? That Cadillac's DTS, a full-sized luxury sedan with a V8 engine, is greener? Could it be, in fact, that seven different luxury-class automobiles are all greener - and that three of them are Cadillac models?