Ok, Here is a problem that has had me stumped for awhile, mabe someone here that has had this problem and fixed it can pass the knowledge on.
My 2012 RAM 6.7 cummins, auto which I deleted ran great for years, my Evic was even accurate. I would average approx 19-20 mpg per fill up until I messed up and let a dealer do an update. After the update my evic is now wrong, It reads what I should be getting, but now Im only getting 16-17 mpg per fillup. Seems the more city driving I do the more the evic is off. I upgraded from a mini maxx to mm3 hoping the newer tuner would fix whatever was done. No dice, still have the problem. I know its tuning related and in an area that is not generally modified with tuners. So, I wondering if possibly my injector codes were deleted by the dealer during the update and now causing the the extra fuel consumption and throwing the Evic off 10-15%. Or something else.