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.
what size wheels do you have paired with the 31 geolander's? Looks nice!