I’m thinking when going into Missoula MT in summer, 104F 3200ft had to clear a pass to the south at 6,000+ - in a Cessna 152.
Did you have the “Duals” installed... BOTH sets of bicycle pedals?
I used to live at 6200’ elevation, flying an old, tired Bell Jet Ranger out of the back yard. One monthly mission was to pick up a medical team at 7500’ and fly to a bush clinic at 10,500’ for the day. I’d have to wait until an hour before dark to take off coming home.
BTW, this was about 1 degree north of the Equator.