I especially would not lend a 2-cycle tool out and I would not put my 2-cycle gas in someone elses saw or whatever else. Be my luck I would get stuck with a rebuild job.
I waited nearly 6 months for a contractor I hired, to install rip-rap on a a few hundred feet of deep creek bank. He needed to clear scrub vegetation, weeds and small saplings, and couldn't get his chain saw to run. He told his teenage helper to start swinging a weed sickle, which he did for a while, but wasn't making much progress.
I asked him what he was going to do, and his answer was to probably come back another time. (???). So I offered to loan him my chainsaw and brush-cutter, both of which I bought new more than 25 years ago, always take proper care of, and they have never failed me.
I filled them with my Amsoil 2 stoke mix (light blue), and fired them right up. They used them for most of the morning, then took a lunch break. I saw the young lad fill the tanks from their 5 gal gas can, and they started using them. Then I saw them using the sickle again, so I went out to see what was going on.
Contractor said your saws aren't working. Asked why, and he shrugged it off, and said their probably too old. I said, they might be old, but they run just fine (both were Homelite 2 stroke saws).
Turns out, he topped them off with straight gas, not 2 stroke, and said their your saws; it's not my problem". He never gave me even a dollar off his more than $18,000 bill.
Both engines were seized. Scored cylinder walls, broken ring and scored pistons. Both saws trashed, and I never even got a thank you, or a sorry about the saws.
Some people are just takers. There is only one person, a good friend and retired jet engine mechanic, who I will load tools or equipment to. Otherwise, no.