Tire size for optimum fuel mileage - Ford Powerstroke Diesel Forum
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Old 11-30-2007, 09:45 AM
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Tire size for optimum fuel mileage

Ok guys, I have got an 06 F-250 4x4 crew cab with a short bed. It's got the 6.0L in it. I have recently rebuilt this truck from the ground up. Someone had wrecked it and hit every inch of this truck. BUT what I am wondering is this: I drive close to 200-300 miles every day for work ( and yes I do have a little honda I drive for good fuel mileage) but some days require me to haul trailers or go back into the mountains. So I need to be getting the best possible fuel mileage out of this thing. I am going to be putting an AFE stage 2 intake on it. Cut the muffler and run a straight pipe through it.

What I need help with is deciding on what size tire to run. I am deliberating between a 265 or 285. I will most likely be purchasing a fairly "roadish" tire. The majority of my driving will be in between 65mph-75mph. Which tire will provide the best mpg and put me in the right RPM range for this truck? Also I have 373 gears on the truck. If anyones got any suggestions on good solid tires that will last let me know! I usually am buying buck shots but I need to start being practical now with fuel prices the way they are.
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Old 11-30-2007, 09:49 AM
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I like 285/75R16 that is what I have been running on my truck since day one. Well I purchased the truck with the firestone 265/75R16 but went to the tire store and had them swapped out for the 285's. As for which tire is best for your application. I would get an all terrian. Just keep them rotated and they will last a good amount of time.
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Old 11-30-2007, 09:50 AM
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I would imagine the 265's would get slightly better mileage. The bigger the tire the more rotating mass it has, but I don't think there will be much difference between the 265's and the 285's.
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Old 11-30-2007, 09:52 AM
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I run 265/75r16 on my 1999. I have had as high as 18.5-19mpg on the highway at 60mph. (hand calc, not lie-o-meter)
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Old 11-30-2007, 09:53 AM
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Quote:
Originally Posted by Echo View Post
I would imagine the 265's would get slightly better mileage. The bigger the tire the more rotating mass it has, but I don't think there will be much difference between the 265's and the 285's.
285's and 265's there is about 1.5 inch hieght difference. fuel Mileage I get around 20-21 highway and 18-20 city. But I have the 7.3L
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Old 11-30-2007, 09:56 AM
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Regardless of what you get, make sure to have a good load range E tire and have them above 60psi (80 max) at all times. The higher the pressure, the better mileage... but the ride will be a little rougher.
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Old 11-30-2007, 10:02 AM
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Quote:
Originally Posted by bigcountrysg View Post
285's and 265's there is about 1.5 inch hieght difference. fuel Mileage I get around 20-21 highway and 18-20 city. But I have the 7.3L
I didn't realize the 285's were that much bigger.
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Old 11-30-2007, 10:05 AM
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I had thought about running the BFG AT's but they are a wide tire and personally I think they do almost as good as a road slick in the mudd. For the amount of money you pay for them, you dont get that much bang. Anyone had any good experiences with a road tire of somesort? I did run the firestone steeltex on my old 99 7.3L and they worked pretty good. Got 18mpg out of it.
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Old 11-30-2007, 10:11 AM
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Quote:
Originally Posted by Echo View Post
I didn't realize the 285's were that much bigger.
When you look at a tire size conversion chart. a 265 is lined up with a 31"tall tire. The 285 is lined up with a 33"tall tire. But really the 285 is more like 32.5 inches. The 265 is about as close to 31inches as you can get with out getting a 31 inch tall tire.
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Old 11-30-2007, 10:26 AM
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I ran BFG A/T's on my 97 F-350 gas pot and they were'nt all that bad in mild mud at all good to about 15" of the stuff and if your mostly on the highway they should be good cause they wear quite well if rotated properly
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