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Old 06-26-2013, 03:35 PM   #1
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Fuel mileage drop

Hey Everyone,

Looking for some general advice on how much i can expect my fuel mileage to drop after moving from stock 215 tires up to 33x12.5s. I just finished installing a 4 inch lift and really want to get some beefy tires on as the stock 215s now make Ol' Tugger look like a rolling skate. However, I'm moving in a couple weeks to Miami (1600 mile drive and pulling a small uhaul) and if the 33s are going to KILL my mileage, ill suck it up and wait until I'm down there to have them installed. Thoughts?

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Old 06-26-2013, 03:39 PM   #2
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yes they'll kill your mileage, especially pulling a uhaul...

my guess is you'll get around 15/16mpg with normal driving...with the uhaul, i bet you'll be around 13-15 on the hwy

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Old 06-26-2013, 03:40 PM   #3
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you have 4 cyl or 6 cyl? what gears do you have?
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Old 06-26-2013, 04:06 PM   #4
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6 cylinder 4.0L with Dana 35 (stock 5 speed trans on 99 tj)
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Old 06-26-2013, 04:12 PM   #5
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Plan on re-gearing when you go to the larger tires or you'll loose a lot of performance and gas mileage.
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Old 06-26-2013, 04:33 PM   #6
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Quote:
Originally Posted by coreydye View Post
6 cylinder 4.0L with Dana 35 (stock 5 speed trans on 99 tj)
Your pushing the limits of the D35 with 33"s. But you will needv to regear. If you have 3.73 gears it won't be that bad. I get 14 with 33"s with the 4.0 5 speed and 3.73 gears.
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Old 06-27-2013, 11:00 AM   #7
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wow.. starting to feel like a real amateur. when we talk about re-gearing, that means im going to have to replace the whole tranny right? Didn't really budget that in to the cost of lift and tires. Any advice on the most economical way to go about re-gearing?
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Old 06-27-2013, 11:02 AM   #8
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Quote:
Originally Posted by coreydye View Post
wow.. starting to feel like a real amateur. when we talk about re-gearing, that means im going to have to replace the whole tranny right? Didn't really budget that in to the cost of lift and tires. Any advice on the most economical way to go about re-gearing?
Regearing refers to putting lower gears (higher numerically) in the front and rear differentials in the axles.
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Old 06-27-2013, 11:13 AM   #9
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Quote:
Originally Posted by coreydye View Post
wow.. starting to feel like a real amateur. when we talk about re-gearing, that means im going to have to replace the whole tranny right? Didn't really budget that in to the cost of lift and tires. Any advice on the most economical way to go about re-gearing?
As PStov98TJ said. And you'd need 4.56's. and that'll cost around a grand. But as I said I've been running 33's with the 5 speed and 4.0 with 3.73's for over a year now. Not sure what gears you have. It should say on a tag on the rear diff.

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