Well, I live at 5000 ft above sea level. We have a great 5000 ft runway at our airport. Most of the planes that frequent our airport are powered by air cooled engines making about 2-300HP ( at sea level)- not 6-700 HP. Got plenty of air running over the engine and related fuel system on the ground. I also belong to the local car club ( also at 5000 ft above sea level ). Most do not run Av gas. Those that do, run a pump back by the fuel tank to keep the fuel line pressurized - to prevent vapor lock. Obviously KOS has never experienced this "phenomenon" and just blows it off as BS. Rooky! Did I mention heat soak problems when running Av gas? If you think E10 is bad, let me know how long the crank time is with Av gas sitting in them float bowls - or should I say - aint sitting in them float bowls after the carb heat soaks for an hour or so.