Question about 2007 GMC Sierra 1500

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I have a 2007 GMC 1500 5.3 V8. Once I got 45,000

I have a 2007 GMC 1500 5.3 V8. Once I got 45,000 Miles gas milage went from 19MPG to 17 MPG. Engine runs good no miss, good idle.

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Ever tuned it up? sounds like its due. plugs, wires, fuel filter (if equipped), PCV, and an intake system cleaning should restore your fuel economy to where you want it.

Posted on Dec 11, 2009

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If you have the RT with the 5.7 hemi as stated I do not beleive you ever got 27 to 29 miles to the gallon. the best that car will do is 24 - 25 miles to the gallon and that is on a pefectly flat and straight road at about 60 miles an hour. As fas as the MDS the best way to tell (if you can't feel it change) is to use a tool such as the dashawk that monitors the engine stats. I disabled the MDS for several reasons and really so little to no change in gas milage. I do not beleive the MDS helps as much as people would like to think. I have added a lot of mods to my hemi, but still think that 14 - 18 mpg under normal driveing is good for this car

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