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Unread 02-11-2014, 12:52 PM   #76
Registered User
1998 XJ Cherokee 
Join Date: Feb 2014
Location: Montreal, Qc
Posts: 3
Gas milage


hello my jeep is killing me with gas consumtion 260 kn per tank... new 02 sensor and injector rail was liking...till same problem.. but when i touch the injectors, rail.. etc... then i got 350 km... Please help!

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Unread 03-11-2014, 11:20 PM   #77
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2004 WJ 
Join Date: Mar 2014
Location: pittsburgh, pa
Posts: 37
My mostly stock fipk 4.7ho gets 13-14 mixed and 18-19 hwy. I run 91-93 octane. I installed plastic to block the about 3/4 the rad on this and my truck in the winter. The quicker it gets there and the warmer the engine runs, the better the mpg.
My old 94zj 5.2 got 1-2 mpg higher mpg after I did a electric ford super coupe fan mod. Much faster warm up and less stress on the waterpump.
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Unread 10-22-2014, 09:51 AM   #78
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2008 JK Wrangler 
Join Date: Oct 2014
Location: fort myers, fl
Posts: 1
very poor gas mileage

I have a 2008 wrangler , 3.8 , manual transmission with only 30,000 miles . I am getting approx 12 miles/ gal. engine light is on so the dealer ran a diagnostic to detemine issue. they told me i needed front and back 02 sensors replaced , which i did. 30 miles later engine light is back on and no improvement in gas mileage.
any suggestions ?
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faq , gas mileage , improve mpg , miles per gallon , mpg , poor gas mileage

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