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Unread 03-18-2013, 03:51 PM   #31
1shotwonder
Registered User
2002 TJ Wrangler 
 
Join Date: Jun 2012
Location: Berks county, PA
Posts: 384
That does seem a little low.. Most likely O2 sensors.. Pre cat ones.. When i was stock i was getting between 18-20 on highway, and around 15 in the little towns around here... Now that i'm running bar lights, 2 inch lift and 33's on 3.73's, along with at least 1 bad 02 sensor, i'm barely breaking 10mpg

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Unread 04-01-2013, 08:42 AM   #32
Jakes93yj
Registered User
1993 YJ Wrangler 
 
Join Date: Mar 2013
Location: Mount Holly, North Carolina
Posts: 42
I'm back from my trip, after a 3.5 hour highway drive I averaged 14.9

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Unread 04-01-2013, 09:58 AM   #33
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,831
14.9 is a little low but it could be higher. Replace the O2 sensor and check your exhaust manifold for cracks and loose bolts. When is the last time you tuned it up?
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Unread 04-01-2013, 10:02 AM   #34
Jakes93yj
Registered User
1993 YJ Wrangler 
 
Join Date: Mar 2013
Location: Mount Holly, North Carolina
Posts: 42
Not sure, I believe september when we bought it from my cousins, no loose bolts

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Unread 04-01-2013, 10:20 AM   #35
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,831
Do the check for an exhaust leak and change the O2 sensor. It doesn't have to be a big exhaust leak to effect the O2 sensor.
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Unread 04-01-2013, 06:34 PM   #36
Reno72
Senior Member
1992 YJ Wrangler 
 
Join Date: Jan 2013
Location: Cardiff by the Sea - Glamis North, Ca
Posts: 595
I'm wondering if all these bad MPG's are part due to not calibrating your odometer after getting bigger tires. If I'm not mistaken if your off 10% in mph you'll be low 10% on your odometer mileage. My 32x11.5 run about 10% off so if I get 290 miles on the odo, I really did 319 miles. I just did a complete tune-up and sensor replacement to pass smog, I got a little over 18 MPG mixed driving with my 32"s and a 3 inch lift, I was quite surprized, I'm going to chack mine again with my GPS to make sure.
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