Originally Posted by lowrider284
Hey guys just looking for some input on your 6.0 gas mileage with/without mods. Got my bone stock 05 last week and my mpg average has been horrible with at least 50-60% of my driving being highway im averaging 11.5-12.5 mpg?!?!
I bought my 05 last year and was my first. i thought it was a little sluggy. I am mechanically inclined on n/a but diesel is a different story. My first mod was a programer to see what was going on. Found that egt's were slightly high and eot was slightly high. mileage was running around 12-14 on freeway. truck is lifted on 35's, deep down i knew there was something wrong. drove for 3months and got worse over time 7-10 mpg's.
took it dealer and the problem was #4 injector was toasted. replaced the whole side since i was in there. and vwahla 18-22 depending if i am behind someone all day long!!!! runs like a champ
that was my solution may not be yours, have your injector checked around 100 bucks for scan they will tell you what one and what side