Another tire size/MPG question - JeepForum.com

 
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post #1 of 8 Old 01-06-2011, 07:30 PM Thread Starter
05WK98TJ
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Another tire size/MPG question

Right now I have 31x10.5 Hercules MT and I am looking at either 31" or 33x10.5" BFG AT. I have a 4.0L 5 speed and 3.73 gears and I am wondering if I will gain/lose MPG with the 31" or 33" AT. And how much would it be?

And what if I ran a 33x12.5 AT what would the MPG difference be?

Thanks

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post #2 of 8 Old 01-06-2011, 07:39 PM
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As long as you keep the 3.73's. The 33's. You will be looking about a 2 mpg drop city. And about the same on the highway.

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post #3 of 8 Old 01-06-2011, 07:52 PM Thread Starter
05WK98TJ
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I assume if I went with 32x11.5 AT's the difference would be 1 mpg. Is there any difference between AT and MT tires affecting MPG's?
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post #4 of 8 Old 01-06-2011, 08:10 PM
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at's do have a minor benefit when it comes to mileage, but it's slim when looking at the same size...maybe .5 mpgs to 1mpg max

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post #5 of 8 Old 01-06-2011, 08:17 PM Thread Starter
05WK98TJ
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ok well I would be more worried about the noise from the MT's. I will be driving about 300 miles round trip on weekends(half of them) in the fall when I go to college. So everything helps. Looks like 33x10.5 will be the way to go.
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post #6 of 8 Old 01-07-2011, 09:07 AM
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Quote:
Originally Posted by 05WK98TJ View Post
ok well I would be more worried about the noise from the MT's. I will be driving about 300 miles round trip on weekends(half of them) in the fall when I go to college. So everything helps. Looks like 33x10.5 will be the way to go.
If it seems that the 3.73's are not pushing your tires good enough for you. Look into going to a re-gear of 4.10's. On hills or going up small grades you may notice where you made it in 5th gear. You maybe shifting down to 4th to keep your speed up. But it isn't a big deal.

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post #7 of 8 Old 01-07-2011, 09:32 AM
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i have 33's MTRs with 3.73 gears and i get 14 MPG

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post #8 of 8 Old 01-07-2011, 09:41 AM
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If you are concerned with noise and do a lot of hwy commuting, MTs are not the way to go. The better ones will start out OK, but with wear will get noisier. If you are just looking for a good looking tire, with decent on and off road performance, have a gander at the Duratracs.

Quote:
Originally Posted by 05WK98TJ View Post
ok well I would be more worried about the noise from the MT's. I will be driving about 300 miles round trip on weekends(half of them) in the fall when I go to college. So everything helps. Looks like 33x10.5 will be the way to go.
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