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Unread 08-14-2010, 11:14 PM   #1
ratfink4545
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31" to 33" mpg difference?

thinking about eventually making the switch to 33's and a four inch lift. Its my dd so im wondering how much of an impact it might have on gas mileage. anybody had a before and after and know how much worse it was?

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Unread 08-14-2010, 11:28 PM   #2
Krochus
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If you're asking I'm gonna assume you care about economy so let mr say this.


Don't
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Unread 08-14-2010, 11:29 PM   #3
Toms87
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There are other factors besides tire size, such as gear ratio.
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Unread 08-15-2010, 01:43 AM   #4
NineohsevenYJ
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I run 33s on about a 5in lift with stock gears (as far as I know) & I get about 16mpg & that's with a fullsize spare, winch, heavy as all get out front/rear bumpers & hard top. Seems like decent gas mileage to me. Oh & it's a 6cyl w/manual tranny.
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Unread 08-15-2010, 02:17 AM   #5
dagoober
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i have a 4 banger with 33's and a 4 inch lift. its my daily driver. i tend to stay away from the highway as its fairly difficult to get it up to 100 kph. it likes to stay around 80. as for mileage it kinda sucks. i had 31's on when it was stock and it was a fair bit better then. i went driving on some logging roads for about 4 hours non stop today and went through about 20$ in gas. hope that gives you an idea.
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Unread 08-15-2010, 07:54 AM   #6
ZeroGravity
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If you're worried about fuel economy then just don't do it...If you have a decent set of mud terrains just wheel what you got and you'll be good.

Do you wheel your Jeep?
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Unread 08-15-2010, 09:05 AM   #7
TebbsJeep
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with my 33s and 3.55 gears with a manual i can get 18mpg if i stay around 50, but if i cruise around 70-80 i get about 15mpg.
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Unread 08-15-2010, 09:25 AM   #8
jeepKY
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I've got a 2.5 L auto with stock gearing and I still get right at 18 with my 31s.
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Unread 08-15-2010, 12:34 PM   #9
ratfink4545
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i do wheel often, and im trying to decide if the drop in economy outweighs the boost in performance offroad. i would probably do it but im worried i wont be able to afford to wheel as often because there are really no spots within an hour of where i live. for that reason, trips will end up costing a lot more. Anybody with a 4 cyl yj on 33's that can tell me what gas mileage they get in town and on the highway?
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Unread 08-15-2010, 12:45 PM   #10
rikkards
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Just to give you an idea, I went from 31's to 33's last week, and filled the tank the same day. Normally I would get 230-250kms for $35 which is about 1/2 a tank depending on the day. I filled the tank when I put the new tires on and it is about 3/8s of a tank left on 211kms driven. So that should be about 170kms for half a tank if I did my math right. Take that with a grain of salt due to inaccuracies of the guage. I am still running 3.07s but will be going to 4.11s in about a week or two.
P.S I am too lazy to do the conversion to mpg
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