[Hazwaste]

Made me remember ads in the back of PM for gas line magnets, which were “guaranteed” to improve gas mileage by 40% or more. What a crock.

[PUGACHEV]

I always wondered about those gizmos. Apparently, so did PM so they did some tests. The results were that, at best, these devices did nothing, while many actually reduced both horsepower and fuel efficiency.

https://www.popularmechanics.com/cars/a310/1802932/

[Bob434]

They worked. Peol,People, just didn’t know how to use them properly. I do and I’m not telling