I haven't run into gas that goes bad yet so I can't confurm what alot of people are saying about gas going bad but they say it turns gummy in carbs and inside tanks in a few months and adding a stabilizer will make it last up to a year. I have had gas in a can for the lawn equipment for over 6 months and never seen it go gummy. Does the gasser engine need after run oil or some kind of protection for the cylinder and the carb (like Glow) after running the gas/oil mixture or do you just leave it alone after flights. Also do you run out the extra gas in the carb when finished flying or is it okey to leave it in.