The tiller, by it's nature gets loaned out. My new rule is going to be buy and bring me a container of Sta-bil(tm) before you take the tiller. At least with Sta-bil, if they leave gas in it, it won't turn to varnish.
/johnny
Sta-Bil goes in my 5 gallon cans when I fill them. There is a fuel bulk plant that sells real gas for off road use but I haven’t tried it yet.