But again after a tank or 2 on the ground to get the needles where I want, and up it went. I don't tune for max RPM's I tune to make sure it's on the rich side but still a strong 2 stroke mode and will stay running W/O a dead stick and go from there. I also say that a engine will run cooler in the air, agreed 5.4 degrees F per 1000 feet is all but counts and is not the whole pic, wind chill factor call it what you want but its there when air is moving over and around the engine or anything for that matter.
Only ABC engines will be reliable after just two tanks. And even with them I run a couple more just to be safe. Ringed engines may seem ok after a couple of tanks, they may even run right for a flight or two. But usually the compression will change and get worse, better, worse, etc before the rings seat and this could cause a dead stick. I don't think I have run any ringed engine on less than a half gallon before flying, and some have taken over a gallon.