I agree with Roger. My trips are usually 300+ miles, and I generally fly them in the 9500 - 13000 ft range. My 337 is N/A. No T, no P, not even O2 built in. Instead, I have the "tank+snorkel" from PreciseFlight, with a conserver that makes it lasts over 600 miles for 2 people on board. I fly the Rockies as well, and the N/A has never had a problem.
Bottom line to me as well: Keep it simple.
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To the Blue Room!!
Jakes Dekker
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