AS I said in my thread on comments on the new tune the mileage seems the same, but obviously cannot be confirmed down to the exact tenth of a mpg with so little driving. What is clear to me is that if there is a change it is only a tenth or two either way. I am not using the truck a lot nowadays so mileage accumulation isn't fast. I will report any changes I am confident of.ALSO, Howie12 (and anyone else that had the AEM done and hasn't had any problems) how about the fuel mileage? 130 miles maybe be too early to tell.