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Re: Increase mpg
What gears do you have? My 08 4.8L with 3.23's got that kind of mileage around town. Not enough gear...
Like the others said, go custom tune. Blackbear Performance, Google it. That's what I have on my 5.3L '08. I had the 4cyl mode turned off and still get 16-17mpg around town. Averaged 19.3 on a 500 mile trip recently.
Your dealership is right, PCM tune will void your warranty. You can purchase another computer to swap out with the original if you have to go in for service though. Oh.... and find another mechanic, yours has been breathing in too many exhaust fumes!!!
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'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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