37's so much better than 35's in every way - Ford Powerstroke Diesel Forum
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Old 05-29-2010, 05:38 PM
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37's so much better than 35's in every way

Hey guys,

So I just recently upgraded my tires with a set of welfare rims and tires. I paid $400 for a set of 27x12.5xR20 BFG At's with 60% tread and they came with a set of 20"x10" Eagle Alloy Rims that has some chrome flaking going on.

I will post some pics once the sun finally shines but I just wanted to let every one know the effects of upgrading on my truck from the 35's.

Now i have an 08 F350 with about 6" of lift. My fuel economy with the 35" Toyo Mt's has been religiously around the 12mpg city and 16.5mpg highway. Since bumping up to the 37's my mileage has jumped to 13.5 city and I am seeing 17.5 on the highway. In addition, I recently added a drop in AFE oiled filter and it gave me another 1mpg+

My latest fuel numbers on the last couple tanks were 15.5mpg pulling a boat 100miles with the remainder being city driving. 17.5mpg pulling a 20' flat deck trailer and 18.3mpg pulling a 20' flat deck with a motorcycle and the new air filter installed. And last weekend I did a trip to visit the family and averaged 17.5mpg and was pushing a 60km/hr head wind with rain for half the trip with sidewinds for the rest of it.

I cannot believe how much better this truck does with bigger tires and a better less restrictive airfilter and the boost numbers have dropped from 9psi to about 5psi when cruising at 65mph.

In addition, I have noticed the ride is much smoother and the truck seems to wander less with the AT's and i was running 50lbs in both sets of tires. I think the softer smoother rides has mostly to do with the softer sidewalls and the fact that my tracking width with these rims is 4" wider because of the backspacing.

Just loving it.
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Old 05-29-2010, 06:19 PM
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If I were guessing one of the biggest dif in the tires is getting rid of the toyo mts, Ive got two sets on two trucks and I love the way they look but I think they suck the fuel and the power, I have put stockers back on a couple of times and its unbelievable the diff of them and the toyos
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Old 05-29-2010, 08:57 PM
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Its cuz you went from MTs to ATs
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Old 05-29-2010, 09:11 PM
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The tire compound is also softer...
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