But I dont believe I was "Taking the Cake" with that stint...just did it one morning, taking off from my "home field", arusha (app100km away). I was confident not to get any altitude issues as I used to climb Mountains a lot and Using high winds to get somewhere(in Africa=dist.) with a slow Trike at FL14-16. Otherwise here we have prevailing 40km/h monsoon slowing you down a lot.
I do remember having read that recently someone flew over mt Everest? in a trike? Some French guy. His mashine was powered with a 914 though.