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Old 01-21-2011, 12:00 AM   #1
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How much does tire width affect mileage?

Hey,
I'm looking at getting 33's soon... Would 12.50 make a difference in mileage instead of 10.50? Maybe that's a stupid question... Thanks for your help, though!

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Old 01-21-2011, 03:28 AM   #2
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more rubber turning is going to mean worse mileage. i wouldn't think it would be that noticeable though.

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Old 01-21-2011, 04:13 AM   #3
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Actually 2.5" makes a big difference , I'm doing my best not to insert a distastefull joke here.
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Old 01-21-2011, 08:42 AM   #4
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-YES, but just putting on the 33s will make a big diff-


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Originally Posted by wranglernut View Post
Hey,
I'm looking at getting 33's soon... Would 12.50 make a difference in mileage instead of 10.50? Maybe that's a stupid question... Thanks for your help, though!
Your engine will need more (POWER), gas because of--More weight/More rubber to turn and the wider "patch" will take even more power, but you'll never know the diff. because of the other mileage DECREASERS !!

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Old 01-21-2011, 08:59 AM   #5
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[/QUOTE]Your engine will need more (POWER), gas because of--More weight/More rubber to turn and the wider "patch" will take even more power, but you'll never know the diff. because of the other mileage DECREASERS !![/QUOTE]

Is that what regearing is used for? Would that restore some mileage and power? Thanks for all the helpful replies!
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Old 01-21-2011, 09:04 AM   #6
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bigger tire=lower gas mileage. No way around it. Regearing can help, so the engine isn't working so hard. BUT...if you are going to do a lot of offroading...then the regearing is going to work against you offroad! So decide which way you want to go...and set it up for the one you do the most of. And unless you really need the wider tire for major rock crawling, go with the 10.5. You will get better gas mileage and less tire noise on the highway, and still have plenty of tire for offroading. If you go with 33's, no matter what width...consider the regearing. Or at least a computer chip (SuperChip) to recalibrate your engine computer for the different size tires. So your odometer and speedometer are working correctly!
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Old 01-21-2011, 09:07 AM   #7
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Quote:
Originally Posted by NHrubicon
bigger tire=lower gas mileage. No way around it. Regearing can help, so the engine isn't working so hard. BUT...if you are going to do a lot of offroading...then the regearing is going to work against you offroad! So decide which way you want to go...and set it up for the one you do the most of. And unless you really need the wider tire for major rock crawling, go with the 10.5. You will get better gas mileage and less tire noise on the highway, and still have plenty of tire for offroading. If you go with 33's, no matter what width...consider the regearing. Or at least a computer chip (SuperChip) to recalibrate your engine computer for the different size tires. So your odometer and speedometer are working correctly!
Thanks so much for the info! 10.5 it is!
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Old 01-21-2011, 09:15 AM   #8
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Heh Heh, I kinda agree with most of what you say, but


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Originally Posted by NHrubicon View Post
bigger tire=lower gas mileage. No way around it. Regearing can help, so the engine isn't working so hard. BUT...if you are going to do a lot of offroading...then the regearing is going to work against you offroad! So decide which way you want to go...and set it up for the one you do the most of. And unless you really need the wider tire for major rock crawling, go with the 10.5. You will get better gas mileage and less tire noise on the highway, and still have plenty of tire for offroading. If you go with 33's, no matter what width...consider the regearing. Or at least a computer chip (SuperChip) to recalibrate your engine computer for the different size tires. So your odometer and speedometer are working correctly!
Any regearing, to a LOWER GEAR RATIO, done on a four wheel drive , will have nothing but benefits for off-road use, unless you're a sand hill climber !!

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Old 01-21-2011, 09:16 AM   #9
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Thanks so much for the info! 10.5 it is!
Keep in mind 33x10.5's are VERY hard to find.... I think only 2 companies make them that size, and one is on national backorder for ever....
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Old 01-21-2011, 09:17 AM   #10
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Keep in mind 33x10.5's are VERY hard to find.... I think only 2 companies make them that size, and one is on national backorder for ever....
x2. I really wish more came in 10.50s...I would much prefer the narrower tread.
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Old 01-21-2011, 09:27 AM   #11
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Trouble with a 10.5 vs 12.5 vs 13.5 is-ITS ALL ON PAPER !

Whatever the advertised size/width of the tire is all dependant on the wheel sise, air pressure you use and ACTUAL INSTALLATION SIZE

My Hankook Dynapro MTs LT 295/75x16 advertised at 33.6" diameter and 12.5" width are:

33.2"dia. x 11.4" width

SO if you put your advertised 285x70x17in tire on an 8" wide wheel, it's probably gonna be

31.8 dia x 11" width

Buyer beware--don't go for the hype, the tread may be a little narrower, but not much !!

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Old 01-21-2011, 09:54 AM   #12
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If you can get a set of 16" wheels, 285/75 16 is 33" tall and only about 10" wide. That's what I have, and they are a little better on gas than 12.50s... but I still don't like them. I prefer the wider tire.

Also, proper gearing is better in EVERY situation. On and off road.
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Old 01-21-2011, 09:55 AM   #13
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more surface contact means more resistance. More resistance = more friction. More friction means more gas used.
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Old 01-21-2011, 10:06 AM   #14
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I think it's going to be such a small difference that it will barely be noticeable. Mileage on Jeeps vary so much, just do a search on what people post as mileage and what there setup is. I think wear of the tires and the tread you choose is going to make a bigger difference than actual size, or at least a difference you will notice. I run 33 12.5s but I'm considering going with a thinner tire, but I'll have to change rims.
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Old 01-21-2011, 12:26 PM   #15
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Quote:
Originally Posted by PTaylor View Post
I think it's going to be such a small difference that it will barely be noticeable. Mileage on Jeeps vary so much, just do a search on what people post as mileage and what there setup is. I think wear of the tires and the tread you choose is going to make a bigger difference than actual size, or at least a difference you will notice. I run 33 12.5s but I'm considering going with a thinner tire, but I'll have to change rims.
So, just for grins, how many miles are you going to have to drive to break even after the cost of new wheels and tires? I'm thinking about a million....
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Old 01-24-2011, 01:56 PM   #16
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So, just for grins, how many miles are you going to have to drive to break even after the cost of new wheels and tires? I'm thinking about a million....
Depends on the tire. I've ran mud tires and AT tires. Big difference in mileage between the two. even going from warn out tire to a new tire I noticed a little better gas mileage. I drive the same route everyday, and reset my odometer every fill up. After several years of driving it, I can tell what makes a small difference on mine

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