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I'm getting 19-20 with 33X10.5 BFG MT's and 4.10s (yes corrected), 5 speed 22RE. And I live at 3000 and comute over one 4000 ft pass almost everyday and about a 3rd of the time over another pass nearing 6000 ft.


This is actually very good mileage. You will drop about 4 numbers in torque and HP for every 1,000 feet increase in elevation with a 22R. The 22RE will not lose quite that much.
Gnarls.