Wheel/tire change resulting MPG - Jeep Garage - Jeep Forum

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Old 08-01-2014, 07:29 AM
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Wheel/tire change resulting MPG

Hello All,

I have reading through many of the different posts on the wheel/tire combo changes and after reading through the multitude of posts by other members I have only found snippets of information buried within the other threads.

I will be picking up a set of 2010 18" Sahara Wheels with the Dueler A/T 255/70/18 tires. I was planning on using them for winter driving and off-roading.

I'll be swapping out my stock 20" tires from my 2011 Overland 5.7L and I know they will fit as others have already stated this.

My question is:
What is the weight difference of the wheel/tire combination between the 18" Sahara and the 20" Overland packages? I thought I read it in another thread but can no longer find it.

Some have noted a mpg loss when switching to a larger tire but I'm wondering about a long distance highway trip. Does anyone have any data on mpg differences when switching from the stock 30.5" to the 32" diameter tires.

I have a very long trip coming soon 2500 miles round trip and wondering if I should leave the 20's on or swap to the 18's with the larger 32" OD.

So with this thread I'd like to get data on mpg difference when changing wheel and/or tire sets so everyone may see the data others are getting with their combos.

Thanks.

Currently my stock OEM 20's with the stock Goodyear Fortera 265/50/20 tires I get between 18mpg, mixed 50/50 city/HW, and 21mpg with about 80% HW @ about 70mph.

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Old 08-01-2014, 09:58 AM
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Re: Wheel/tire change resulting MPG

There is a calculator on the Discount Tire Direct site that you can put in two tire sizes and see what the impact is on speed, ODT, etc., which is relevant to MPG.
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Old 08-01-2014, 12:36 PM
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Re: Wheel/tire change resulting MPG

Found this information on another site. (thank you webejeepin)


Stock 18" Sahara Wheel = 27 Lbs
Stock Deuler P255 70 R18 = 44 Lbs

Wheel and Tire total = 71 Lbs



According to Tirerack.com the tires have the following specs.

32.1" OD, 10.2" wide, 7.5" wide tread, 649 revs/mile

now to find more info on the OEM 20" Overland wheels and do some calculations. :-)
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Old 08-01-2014, 03:13 PM
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Re: Wheel/tire change resulting MPG



http://www.discounttiredirect.com/di...nfoTireMath.do
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Old 08-01-2014, 10:24 PM
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Re: Wheel/tire change resulting MPG

I use the wheel/tire combo from a Wrangler and my avg is about 19 mpg. With my OEM 18" wheel/tire, I average 22 mpg.

For long drives and such, I put the OEM wheel/tires to save on fuel. The Dueler AT Tires and Sahara wheels, I use them in winter and for light off-road/trail use.

Hope this helps.

Cheers,
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Old 08-02-2014, 01:51 PM
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Re: Wheel/tire change resulting MPG

Quote:
Originally Posted by Aiyer View Post
I use the wheel/tire combo from a Wrangler and my avg is about 19 mpg. With my OEM 18" wheel/tire, I average 22 mpg.

For long drives and such, I put the OEM wheel/tires to save on fuel. The Dueler AT Tires and Sahara wheels, I use them in winter and for light off-road/trail use.

Hope this helps.

Cheers,
-A
Is that mpg adjusted for the tire change?
Was your ECM changed to the new tire profile so the odometer, speedo, and mpg calculations are according to the tires installed?

I know it is approximately a 5.3% difference between the OEM Sahara 18" tire circumference and the OEM WK2 tires which will effect the mileage driven and reported MPG is not calibrated.
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Old 08-02-2014, 10:29 PM
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Re: Wheel/tire change resulting MPG

Tire width and tire tread type may have some small effect on mpg due to the change in rolling resistance, but tire diameter should not. Like FalconST indicated, it will change your odometer and speedometer readings and make you think it changed the mpg.
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Old 08-04-2014, 01:37 PM
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Re: Wheel/tire change resulting MPG

Went from 20" summit with former as to 18" ORA wheels with Bridgestone Revo2. Both factory size. Have driven 1500 miles in them in a couple weeks. No more than 1 mpg difference. Can definitely live with that to gain the performance.
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