Originally Posted by CuttingEdgeLandscapes
That is a hand calculation. I never go off the dash readout. With EFI LIVE and the other mods done to it. I have no trouble averaging that mileage. And as far as quickness I blow the doors off vettes and mustangs daily.
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24 is impressive, but i would have to see it to believe it...i know my 6.4 will never get anywhere close to that, unfortunately, even tuned...before the tuner i was getting 11.5
what year and engine is your duramax?