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I assume OP is long gone, but just in case he isn't...
I also drive a 1999 4Runner. V6, 5 Speed, 4x4. I have 34" tires for offroading. I have a set of rock sliders, skid plates, real recovery points, winch, etcetera. I keep a set of 31" tires for daily driving though. I don't like offroad tires for use onroad for extended periods. Anyway my 4Runner gets 25+ MPG average with the street tires, and that falls to 23+ with the 34" tires mounted. (I want to build some conveyor belt tire spats to help with that...) Why not try to improve the MPG of what you already have?
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