Cool,
Converted to get about 11psi where I live, at about 7000ft - don't have to breathe very hard when bicycling (lung capacity 125% of "normal".) Have functioned OK at 12Kft (about 8.5 psi). I might last a little longer than the average passenger at 20Kft with 6psi, but I'd probably get pretty darned clumsy after a few minutes.
-dtd
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