Originally Posted by F_Rod81
Unless there is a leak, I think you have a gas thief on your hands. Hopefully the thief is using the gas for the same purpose, if he is not, then he'll have some issues when he puts mixed 2stroke fuel in something that is not meant for it. Quick return karma for him
Mixed fuel won't hurt a engine (except for diesel). The only tell tale would be a little white smoke, and when fuel is added to the tank, it will dilute just about all of it.