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Old 10-02-2012, 04:56 AM
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Is 6 mpg normal for a 1997 wrangler with a 4" lift and 33" tires?

I just bought a 1997 wrangler with a 4" lift and 33" tires and I filled it up, drove it home and did the math and I'm getting 6 mpg. That can't be normal, even for my 4.0. What could be wrong with it and how can I fix it?

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Old 10-02-2012, 04:59 AM   #2
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Old 10-02-2012, 05:02 AM   #3
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Quote:
Originally Posted by wagnerleif
I just bought a 1997 wrangler with a 4" lift and 33" tires and I filled it up, drove it home and did the math and I'm getting 6 mpg. That can't be normal, even for my 4.0. What could be wrong with it and how can I fix it?
Complete maintenance from oil to air filter, spark plugs and the works, can be your gears, do you know what gears you have? Can be an O2 sensor, could be fuel system, or as easy as bad math.
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Old 10-02-2012, 05:02 AM   #4
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Quote:
Originally Posted by wagnerleif View Post
I just bought a 1997 wrangler with a 4" lift and 33" tires and I filled it up, drove it home and did the math and I'm getting 6 mpg. That can't be normal, even for my 4.0. What could be wrong with it and how can I fix it?

Post your question in the TJ tech section.
It depends on what gears, how long it's been since a tuneup, but it doesn't sound normal
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Old 10-02-2012, 05:11 AM   #5
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Old 10-02-2012, 07:25 AM   #6
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Old 10-02-2012, 08:46 AM   #7
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Old 10-02-2012, 09:05 AM   #8
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Complete maintenance from oil to air filter, spark plugs and the works, can be your gears, do you know what gears you have? Can be an O2 sensor, could be fuel system, or as easy as bad math.
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Old 10-02-2012, 01:05 PM
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Originally Posted by JVLemur

Complete maintenance from oil to air filter, spark plugs and the works, can be your gears, do you know what gears you have? Can be an O2 sensor, could be fuel system, or as easy as bad math.
No, its definitely not bad math. But thanks, I'll look into the rest of those
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Old 10-02-2012, 01:08 PM   #10
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Old 10-02-2012, 02:05 PM   #11
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what gear ratio and is your speedo reclabrated for the larger tires. stock back then was 28in iirc so with 33s its going to be off
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Old 10-02-2012, 02:41 PM   #12
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Originally Posted by wagnerleif

No, its definitely not bad math. But thanks, I'll look into the rest of those
Ok that's one to rule out, sometimes it is.
Also as said below is your speedo calibrated for the 33s?
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Old 10-03-2012, 12:43 AM
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Ok that's one to rule out, sometimes it is.
Also as said below is your speedo calibrated for the 33s?
I have no idea, probably not
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Old 10-03-2012, 12:48 AM   #14
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I have no idea, probably not
Ok if it's not, then you'll be losing mpgs. As said, stock tires are 28s, I'm running 31s not calibrated, and it makes about a 3mph difference on the speedo, not exactly sure how much an mpg difference it makes but it's there. But 6mpg isn't close to what it should be, so your gears might not be correct to run the tires, and as mentioned before, might need a complete maintenance.
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Old 10-03-2012, 03:32 AM   #15
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Old 10-03-2012, 04:31 AM   #16
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Wow that about what I average in my semi.
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Old 10-05-2012, 09:54 AM   #17
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I get 10 and I have a 2001 manual with smaller tires and just a 2" lift.
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Old 10-06-2012, 05:46 PM   #18
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I get 10 and I have a 2001 manual with smaller tires and just a 2" lift.
More info, mines an 01 manual and I'm getting between 14-18mpg on 31s no lift.
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Old 10-06-2012, 07:37 PM   #19
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I have a 97 4.0,automatic that gets 15-16 pulling 37 inch tires through dana 60's with 5.13 gears
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Old 10-06-2012, 09:46 PM   #20
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Welcome to the Forum! OUCH on the MPG. Hope you get it figured out.

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