In less than a couple of years, 40 miles per gallon has gone from a lofty goal, met by only a few select high-mileage machines (almost entirely hybrids and diesels), to, almost the small-car highway norm. Now even Mazda is laying claim on 40 mpg in the 2012 Mazda3, with a new-generation engine and all-new transmissions that all fall under the...
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