I intended to wait until I had visited SEVERAL tire spots I know but decided to go ahead and report on one I checked with today.
"Dean" worked at Goodyear, although its been several years. Maybe 10 years? He runs a frontend/tire store now for 6 years.
He states that he and Goodyear, has known about them for years. He stated they DO help in the bigger tires and the Bias tires but "according to him" they do not do the job in todays modern car with "sensitive feelings". He does not recommend them but this does not mean they are good or bad. Just HIS opinion.
My next door neighbor manages "Discount Tire Store" in Spartanburg so he my next victim for "opinions". I'm still looking, listening and asking about all I see about these.
Jeff, I wouldn't say Denny's idea/test is a scattered brain idea. He is simply reporting what he finds and if I know him like I think I do he will continue to prove, or disapprove, to his satisfaction. HE is the one that has invested probably a 100 bucks to do his own evaluation. I'm sure if he uses them in his truck tires he'll give us a good HONEST report. Thanks for guys like Denny that can do these things.