Recently I took a day trip up to Big Bear Lake in CA. "the rim of the world" is a nice little drive that loops in and out of san bernardino. The 99 montero is in need of a tune up and has 4.27 gears, previously it had 33" tires and was getting around 14mpg mixed (offroading, city and highway) after going to Yokohama Geolander 31's, even with a lot of steep grade climbing between 1000-7000 feet it immediately jumped up to 17-18mpg (including city and off road). After a tune up it will get better. I'll keep it on 31's until I can put 4.90's in. Then I think I'll step to 33's as this truck wont need big tires and the gears will make it nice for group camping trips, hauling all the people and gear.
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what size wheels do you have paired with the 31 geolander's? Looks nice!