I bought the 2815 for my 97 k1500 in hopes of better gas mileage. Updated it and installed the MileageXS. I did notice the power increase but never saw any fuel economy. My driving style has not changed from stock to SC tune. After 3-4 tanks, I am still getting the same 13mpg as before. I am going to run a couple of tanks in stock then the 91 tune and compare.
Now to the actual question. I returned my truck to stock and programmed my friends 06 4.3L to see if he would get any better mileage. Do you have any numbers for the 4.3 as far as hp, tq and fuel economy on all the different tunes?
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