As a Montero SR owner, as well as an owner of an LX450, a G500, and some other body-on-frame trucks over the years, I wanted to point out that 20MPG+ on a mid-90's Montero SR is completely inaccurate, totally impossible, and absolutely mis-information.
Body-on-frame trucks with poor aerodynamics weighing 4500lbs+ with larger motors and heavy off-road tires just can't do it. Unibody SUV's can, but real trucks cannot. Maybe in the year 2050.
Actually, let me say that you can probably get 20MPG+ if you tow it to the top of a hill, let the engine idle, put the transmission in Neutral, and roll down the hill.
If you actually drive the thing like any normal person, you will experience mid to high teens MPG, but not better than 17-18MPG.
Fact. Not fiction.