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SC | 140000 miles, 285 tires, no chip just stock. Been noticing the average fuel mileage going down on the display. Its around 13 or 14 where it was staying around 16 to 17 before. I have found the display to be 1 or 2 mpg optimistic. What could be going on? Injectors? Exhaust problems? Have read the claims of chips and tuners, but dont see how more power is made without burning more fuel. Any advice will be appreciated. Thanks | |
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2005 GMC 2500HD with Dmax
