99 Jeep XJ bigger tires...what gear to use?

Q: I have a 99 Jeep Cherokee XJ Sport that had 225/65/R15's on it but now has 4.5" lift and 31x10.5's and it doesnt have the get up and go it used to. What gear ratio should I switch to to get the best MPG and back closer to stock because I only do light trails on occassion and do some interstate traveling. Also where would I get this installed and how much am I looking to spend and where is the best place to purchase? THANKS

A: http://www.onlineconversion.com/bigger_tires.htm Scroll down the page and you will see a part called "Find new Gear Ratio with new tire size". You will need to know your current gear ratio though.

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