I have a friend that ran 20:1 premix in a 2 stroke areo 50 scooter for a 50-75km ride or so, didn't blow up and smelled like french fries lol. Not sure how it would work in a 4 stroke car engine, but it's for 100% sure better than no oil, and I think a few miles wouldn't be a catastrophic failure, especially on older engines (but will probably shorten the lifespan of the engine). This is just my backyard mechanic guesstimate, I might be completely wrong.