Depends on how you define "work".. because I expect some of them make all kinds of claims.
I can say that I have a few older cars with high compression that detonate if I run regular. If I find myself in a situation where I'm not able to purshase premium, I put one of these in and I don't have an issue.
Check the google, I bet it's been studied in labs, just make sure it's an independent study.
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