Wondering what if
I have an n '07 F350 C/C SRW 3" lift and 35x12.50R18 Toyo M/T's on 18x9 wolverines. I have 54k miles on them and am getting ready to put new ones on. Was wondering if going to 33's would make more than 1 mpg if any difference? I know it would be less rolling resistance with the 33's, but if mpg wasn't going to improve by at least 2 than I would rather keep the 35's. I also read all terrains get better mpg than mud tires but with the snow and mud I see plus no limited slip in rear, I feel I get stuck less with mud tires. Current mpg for truck is 13-14 avg city/hwy. No tuner as of yet, but airaid filter, 5" catback, 3.5" downpipe.