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On my automatic 2.5 97 with 33s and a 2 inch body lift, it seems like my mpg is worse when I go on the highway vs main roads. Does this happen to anyone else?
 

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Gearing, more wind on highway and needing more gas to adjust speed if not geared right.
Also if the speedo gear is not updated might throw off figures.
 

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I took a long trip with my daughter in her 98 with the 2.5 and 5 speed. The mileage varied a lot with how fast we went. At 55 mph we got a little over 20 mpg. At 65 it was around 17, and at 70+ it was 15 mpg or less. The wind resistance of the jeep really makes the 2.5 struggle.
 
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