my F350 with 3.55 and 20's and have gotten almost exactly the same fuel mileage on 80 mph cross country interstate trips. I get 18 to 18.5 on the interstate at 80 mph, I get 14-16 mpg around town depending on how much stop and go and I get 10 mpg towing.
thnk you - that is my experiance. Some of these threads had me thinking 18-22 was the norm.
I've got 18"s with 3:31. I've seen 23-25 mpg on 55mph hwy drives. 80 mph on I-40 & i75 see 18-20 mpg.
Took a 2300 mile trip last month pulling 10k enclosed 10.1 mpg. (8.6 was the lowest I got driving way 2 fast).
Anyway the 3:31 had NO trouble w that weight.
I bought a set of factory 20"s off a guy that went with after market 22. I'm going to see how the truck does w the 20/3:31 comb after my current tires wear out.
If I don't give up towing performance with the 331/18s I might as well order that axle with the hope of better mileage empty. If there's little difference in mileage I may go for a bit more performance with the 355/20s. I really don't want to order the 331s only to regret not going with 355s.
On a different note - when does Ford shift production to the 13s? I plan to order in the next few months so I might wait to see what the 13s have to offer.
i no this may be out there a little bit but i got 4.10 and i get 15 around town and interstate is where it kills her if i keep it around 70 it will get 18 but if u get up to around 80 and 85 it drops big time talking bout down to like 14 so from what i see the gear ratio u pick aint really gonna change ur mileage by much its how you drive it
just my 2 cent
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