Two from the top of Indepence Pass, 20 miles outside Aspen on CO 82. It's the second highest pass in the US, over 12,000 feet! I've had the 4Runner up and over the pass, but alas, no pictures. The Yamaha is completely stock and has 4 carbs (not rejetted). It apparently runs lean enough from the factory to not have problems at that altitude. The 4Runner is fuel injected, of course, and didn't bat an eye at that altitude. Bring it on!
The pass closes in October/November and doesn't reopen until like May! I'll have to get some pics of the 4Runner at the top when the pass reopens.