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I towed with my truck at 400 miles and didn't wait the full 1000 and I think I screwed something up... my gas mileage has been HORRIBLE, there's no way this truck should only get 300 miles a tank city driving, right?
DTE resets on each fill up based on recent MPG from current driving habits. So if you just towed and we’re getting 8mpg and have a 36 gallon tank it would display approx 300 gallons (288 if exact) to empty. DTE will increase after you drive a with a few tanks not towing.
Depends on your foot, if you're doing 80% city driving I could see that being the case. Anything other than highway driving I see single digit MPG on my dash with my 7.3. Assuming you have the 35 gallon tank, 300 miles per tank is 8.5ish MPG, not unheard of driving a brick through stop and go traffic. Towing before the 1k miles did nothing to affect your MPG you're seeing now.
I doubt not waiting for the break in period before towing has any effect on your mileage concern. I've read the break in is mainly for the differential.
Have you been towing a fair amount recently? Have you tried resetting the fuel economy "tracker"?
Kidding, just relax the computer will adjust over time.
It's not uncommon for my truck to be down to 3 mpg for 100's miles at time. When I drop a trailer, it takes some time for the computer to reset itself.
Obviously when towing your mileage goes down because of it, but when I'm empty and reset the computer after filling up the truck it gives me how many miles until empty based on the previous mileage. That number (miles until empty) actually goes up as I drive the truck empty since the empty mileage is better..
Did you check to make sure the front hubs are set to AUTO not LOCK? Lots of trucks delivered locked and it knocks mpg down by 1-2 depending. No way towing before 1000 miles has anything to do with your mileage.
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