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Just got my G/F the 3.9l GM engine in a 2008 Impala with active fuel management. AKA cylinder deactivation. So far so good. when driven gingerly, I can get some pretty good numbers on the built in MPG gauge. Of course she drive with her foot in it more than I would. With lots of highway driving she has the average mileage just over 25 mpg. Not bad for a boat of that size...
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