Quote:
Originally Posted by F450Mikey
Good Luck! I have never hit double digits unloaded and get 5-7mpg towing my Weekend Warrior. My truck came it at 9,040 lbs with 3/4 tank of fuel. It is an auto with 4:88s.
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worse case scenario is I don't get 10 plus. But then again, I did not buy this for its mileage.. as most if not all, haven't.
I wonder how much difference the 4:88s make. A guess puts you going down the road doing 60 at maybe 2100 RPMs? I know my 4:30s have me closer to 2000 at 60 MPH. It would seem the higher the rpm the more fuel burned, the warmer the tranny temps get and maybe even engine heat. That was the way it was on my 7.3L with a 3:73 gearing. Out of OD pulling at 63 MPH I was at 2450 RPMs. I know there is a difference and it will effect fuel mileage, just don't know how much.
