Poor mpg

[psd_va]

ok so I tried to get some before but was unable to. My truck is getting 12.5 unloaded, and 10 towing my boat(2800-3klbs) the truck is on 38's so I dont expect the 20 that some if you guys get but I'm not ready to give in and settle at what I'm getting. I recently just changed fuel filters and cleaned air filter throughly. Only thing else I have noticed about the truck is it every now and then had a slight surge at idle.
Please help me to figure something out.

[dannyboy950]

maybe the truck needs to be reflashed to reflect the change in tire size?

[john3488]

That mileage sounds about right. That is about what I get as well.

[van-boy]

heck, i get 9

bailey