If I had idiots using and fueling my equipment, I'd think about adding some kind of oil to every fuel can, including the ones for four stroke equipment. Even 50:1 with Walmart boat oil would save your saw from burning down. Looks like it'd add ~$0.50/gal to the cost of the fuel. Might be worth it, depending on what kind of idiots you have around and how much 4 stroke fuel you go through.
Sorry Mr. Homeowner customer, your lawn now costs $2 extra to mow. Bob's an idiot and can't be bothered to fill the two stroke equipment from the right jug, so now you get to pay for the two stroke oil we run in the four stroke equipment too.
Sorry Mr. Homeowner customer, your lawn now costs $2 extra to mow. Bob's an idiot and can't be bothered to fill the two stroke equipment from the right jug, so now you get to pay for the two stroke oil we run in the four stroke equipment too.