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Old 05-12-2011, 03:29 PM   #1
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Question regear MPG?

Ok, quick question. I have a 1998 TJ with the 2.5l. 33 duratracs and stock gearing (my MPG sucks now). If I regear to 4.88 from stock what am I looking at for MPG? Anyone running this setup or similar that can help me?

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Old 05-12-2011, 03:36 PM   #2
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My friend runs 4.88 with a manual and 32x11.5. He gets about 19 highway.

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Old 05-12-2011, 03:38 PM   #3
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Wow
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Old 05-12-2011, 03:39 PM   #4
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I don't have a 4cyl but I did go from 3.73s to 4.56s with a 6cyl and 33s. Its about the same jump so it might be similar. I've only filled up once, but on this last tank I got 18mpg when i was getting ~14mpg before.
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Old 05-12-2011, 05:16 PM   #5
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I thinking I'm going to 4.88 with my 33's but that's because I have an auto. Sucking gas now with those 4.10's I have now. Doesn't help that I have an MT tire and they weight 52 pounds new each and they aren' that old.
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Old 05-12-2011, 05:34 PM   #6
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i thinkin 4.88's are the best choice. thats what i have (i think) with 4.0, 5 speed, and 35's and i get about 17-18 mpg on the backroads
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Old 05-13-2011, 01:11 AM   #7
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Quote:
Originally Posted by MikeMYJ View Post
My friend runs 4.88 with a manual and 32x11.5. He gets about 19 highway.
4.88 with 32's? Isn't that too high (numerically) for those tires?
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Old 05-13-2011, 01:12 AM   #8
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Quote:
Originally Posted by Hendog View Post
4.88 with 32's? Isn't that too high (numerically) for those tires?
That's what I said until he told me that he gets 19 mpg. He drives 65 miles to work everyday.
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Old 05-13-2011, 05:26 AM   #9
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I was wondering the same thing. I think this goes along with the OP so, I am running 6 cylinder with 33's & 3.73 gears right. I drive rather conservative, coast to stop lights & easy acceleration. I get about 14 right now. What will happen to my gas mileage if I go to 4.11 or even 4.56? Theoretically should it get better?

I also assume I need to regear both front & rear?
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Old 05-13-2011, 06:27 AM   #10
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Quote:
Originally Posted by Danno6102
I was wondering the same thing. I think this goes along with the OP so, I am running 6 cylinder with 33's & 3.73 gears right. I drive rather conservative, coast to stop lights & easy acceleration. I get about 14 right now. What will happen to my gas mileage if I go to 4.11 or even 4.56? Theoretically should it get better?

I also assume I need to regear both front & rear?
I had the same setup as you and went to 4.56. It should get better because the engine is set back in its power band. Also 4.56 is only if you have the 5 speed. The 3 speed auto needs 4.11 and 4 speed auto needs 4.88. Yes you have to do front and back if you ever want to use 4wd. Other wise you will hear something's break due to binding.

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