Automakers make tweaks to eke out better mileage
Bloomberg News
Brandon Depp works on a Chevrolet Cobalt at a plant in Lordstown, Ohio. GM tweaked the Cobalt to get an extra mile per gallon on the highway. With gasoline still hovering between $3 and $4 per gallon, many manufacturers are making far more than the usual tweaks to cars and trucks between model years to squeeze out an additional one or two miles per gallon to attract customers who increasingly rank fuel economy as a top factor when buying a vehicle. 
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