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#1
11-09-2012, 04:47 PM
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2006 sierra, gas mileage fluctuations
I have 2006 gmc sierra with the 5.3. I noticed that when I run my heat the mileage I get drops considerably. When I don't run the heat I get from 15.5-17.5mpg. Truck has 132,000 and runs great. Anyone else have these fluctuations? Any advice?
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