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33"s on Jeep Rublicon.... Better gas mileage?


 
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Rubi2sday
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Joined: 10 Dec 2005
Location: Indianapolis, Indiana

PostPosted: Sun Dec 18, 2005 7:02 am    Post subject: 33"s on Jeep Rublicon.... Better gas mileage? Reply with quote

Will the gear ratio change by going with 33" tires on a Jeep Rubicon? My co-worker told me that he is filling up less at the pumps now that he has put 33" tires on his Rubicon. Is this true?
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WhatWasIThinkin
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Joined: 02 Jan 2004
Location: Epping New Hampsha

PostPosted: Sun Dec 18, 2005 9:34 am    Post subject: Reply with quote

If it is, then all the rest of us have something very wrong going on. Wink

It dosent change the gearing but it does change the final drive ratio by swaping tire sizes without changing the actual gears.

I lost @ 1.5 miles per gallon with my 33's. I doubt seriously that it actually improved mileage.
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IBTJn
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Joined: 31 Dec 2004
Location: Just Outside of Portland, OR

PostPosted: Sun Dec 18, 2005 10:02 am    Post subject: Reply with quote

WhatWasIThinkin wrote:
If it is, then all the rest of us have something very wrong going on. Wink

It dosent change the gearing but it does change the final drive ratio by swaping tire sizes without changing the actual gears.

I lost @ 1.5 miles per gallon with my 33's. I doubt seriously that it actually improved mileage.

Ditto that. Too much info' missing to guess. Driving conditions (i.e. city, hwy, flat terrain vs. hills, etc.). Not to mention driving habits. But as has been said here many times (which I laugh at each time I see it posted) is the placebo effect.

Wink
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Lowrider
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Joined: 08 Nov 2005
Location: Washington State

PostPosted: Sun Dec 18, 2005 3:05 pm    Post subject: Reply with quote

I suppose if most of your miles were driven on flatland freeways you might see an increase in fuel mileage due to your decreased cruising rpm's. Other than that, I don't see it being an advantage.
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But when she saw my rod she reeled.


2006 Wrangler Unlimited
1997 Cherokee Sport 2WD
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BEANS
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Joined: 18 Sep 2005
Location: SECANE, PA

PostPosted: Sun Dec 25, 2005 7:10 am    Post subject: Reply with quote

If your mileage did improve it's a false reading. Your speedo is now wrong due to the tire size change.
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