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When I downshift from 5th to 4th on a hill in my Cobalt, the driver information center "instantaneous mileage" display shows the same mpg before and after the shift. So, I have a bias toward downshifting so as to not "lug" the engine, or even come close to lugging.
BTW, my Cobalt has a tall fifth gear, which is one of the features that enables it to have the highest highway fuel economy of any car that is not a diesel or a hybrid.
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