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i'm getting 12-13 mpg in my 3.5 liter trooper even with 40 psi in the 267/75 tires. I hope it will increase when i change my plugs, I currently have 93K miles.

If you are getting 18, you should be pleased.

Other things that may help are new o2 sensors, new pcv valve, and clean your EGR.
 
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