Some good news

I had my first wave flight early October. I
stopped at 18000 as that was as high as
you can be with a cannula. Then poked
around between the Alberta Livingstons
and Porkies between 9000 and 15000 for
a couple more hours.

The post 18000 part of the flight I had set
the flow for 15000, but after landing I was
so wiped out I had to take a couple days
off from flying.

Folks, especially us older guys, living in
low elevations need acclimation to the
10,000' level O2 systems are set up for.

In the meantime, you lose significant IQ
points and your decision making will not
be as good as when in your armchair at
home.