mpg
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Freshman User
Joined: Feb 2010
Posts: 37
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mpg
I recently switched tires from the contitracs to bf goodrich at ko. Both tires were 275/70/18. My mpg is going down hill quickly. I don't expect great mileage from the truck, but it is getting ridiculous. Is thier anything I can do to improve a little. I at least would like to get back to 12 mpg.my truck is 06 f250 with the 5.4 cc sb 4x4.
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
Don't think tire thread can cost big difference in mpg.
What I would suspect that even with the same nominal size, the new tires have bigger rolling diameter.
Compare rpm of old brand with the new one, or test you speed with GPS.
Quite possible you are making much longer distance than your odometer is recording.
What I would suspect that even with the same nominal size, the new tires have bigger rolling diameter.
Compare rpm of old brand with the new one, or test you speed with GPS.
Quite possible you are making much longer distance than your odometer is recording.
Token Redneck
Joined: Jun 2007
Posts: 9,331
Likes: 341
From: Breckenridge, TX
X2 on the outter diameter being off. You have to actually measure the tire to be sure.
How many miles on the truck? If you're getting into the 60/80 range, there might be some engine stuff going on that just coincided with the new tires.
How many miles on the truck? If you're getting into the 60/80 range, there might be some engine stuff going on that just coincided with the new tires.
Cargo Master
Joined: Apr 2007
Posts: 2,659
Likes: 2
How much did the mileage drop?
Worn tires get the best mileage you will ever see. As soon as you replace tires the mileage will go down some. The AT KO isn't very aggressive tread but it won't be as good as a highway tread. A full 1 mpg difference is within reason given the change you made.
Worn tires get the best mileage you will ever see. As soon as you replace tires the mileage will go down some. The AT KO isn't very aggressive tread but it won't be as good as a highway tread. A full 1 mpg difference is within reason given the change you made.
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Postmaster
Joined: Oct 2008
Posts: 3,924
Likes: 6
From: Richmond BC
you sure ur truck just doesnt need a tuneup or something ???
perhaps teh timing of teh new tires is just coincidence..
perhaps teh timing of teh new tires is just coincidence..
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New User
Joined: Aug 2010
Posts: 3
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Would a taller tire help the mpg's? I have 245 75 17 and looking at
365 70 17 about 1" taller.
03 f350 6.0 got 10 mpg pulling same car trailer.
Truck:
08 F350 Dually
430 gear
v10 6.8
MPG's
9.2 to 9.5 in town
5.5 towing boat 30 ft with T-top
6.5 to 7 Race car trailer 40' GN
365 70 17 about 1" taller.
03 f350 6.0 got 10 mpg pulling same car trailer.
Truck:
08 F350 Dually
430 gear
v10 6.8
MPG's
9.2 to 9.5 in town
5.5 towing boat 30 ft with T-top
6.5 to 7 Race car trailer 40' GN
Token Redneck
Joined: Jun 2007
Posts: 9,331
Likes: 341
From: Breckenridge, TX
Um hate to break it to you, but a 365/70R17 would be 37 inches tall, no where NEAR the 31.5 inches tall you currently have. This has to be a typo, I couldn't even find a tire in this size. You mean 265 right?