Gas mileage so low? - Page 3 - JeepForum.com

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post #31 of 36 Old 03-18-2013, 04:51 PM
1shotwonder
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2002 TJ Wrangler 
 
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Location: Berks county
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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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post #32 of 36 Old 04-01-2013, 09:42 AM Thread Starter
Jakes93yj
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1993 YJ Wrangler 
 
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Location: Mount Holly
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I'm back from my trip, after a 3.5 hour highway drive I averaged 14.9

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post #33 of 36 Old 04-01-2013, 10:58 AM
Que89YJ
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1989 YJ Wrangler 
 
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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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post #34 of 36 Old 04-01-2013, 11:02 AM Thread Starter
Jakes93yj
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1993 YJ Wrangler 
 
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Not sure, I believe september when we bought it from my cousins, no loose bolts

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post #35 of 36 Old 04-01-2013, 11:20 AM
Que89YJ
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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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post #36 of 36 Old 04-01-2013, 07:34 PM
Reno72
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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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