Pull the ECU fuse on the car, let it sit for 10 mins, put it back, fire it up and take it for a drive. After having a vacuum leak, re-learning the fuel trims may restore your MPG.
Regarding the high speed sweet spot, consider yourself lucky. You can get the best highway mpg the car wants to give (at a steady speed) without having to dawdle along like the rest of us.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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