Quote:
Originally Posted by NEVERSWEAT7
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.
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55 mph is 2000 rpm and 68 mph is 2500 rpm with 4:88s. I don't really drive faster than 70 mph. It runs like a sewing machine from 2500 to 3500 rpm... nice and smooth. I didn't buy it for mileage but thought it would be better. After all it is a diesel right? I am happy because it is 1000x better than my old F250 V10!
