I dont have much idle time either. Even when its cold out i only let it sit for a few minutes to get everything warmed up. With heated seats and steering wheel theirs no need to let my truck run for 10-15 minutes to get warm. Thats insane that your 6.2 is getting the same MPG as my 5.3. I'm making a trip to camp this weekend which is about 140 mile round trip and 90% highway. I will drive up stock and drive home with the 87 tune and see if theirs a difference.
Yeah it’s pretty crap. I restored it back to factory and it doing another 3 day test. It got screwed up today from a snow storm and I was stop and go a lot because people don’t know how to drive when it snows lol will post updated results..
I was at first to feel the power difference which was meh didnt expect anything life changing from a MPG tune lol but when I was tracking the MPG the 3 days back and fourth to work I wasn't heavy on the pedal at all.
I searched on here and didnt find much (maybe im just terrible at searching) but I recently tuned my 18 Sierra 5.3 8 speed with the Diablo inTune i3. I selected the canned MPG tune to start and planned on getting custom one later. I also have a Borla Atak and S&B CAI and no leveling kit or lift. With the CAI and Borla Atak I was averaging 18.6 MPG. I tracked this using my 74 mile round trip travel to work for 3 days in a row. After tuning it dropped too 15.4 (I did the math from trip log and didnt just use the trucks MPG tracker)..same route, temperature changed a bit but my driving habits are the same. My commute to work is mostly back roads where im doing 55-60 mph. Anyone else ever have any issues with MPG loss after tuning? Everything I read lead me to believe that the MPG would go up. I'm just more concerned that I did something wrong while tuning. Any help on this issue would be greatly appreciated. Thanks guys!
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