Fuel injector cleaner - worthwhile or worthless?

If they *really* said in effect that the computer wouldn't know how to interpret knocking with "hi-test" but it would know how to interpret knocking with mid grade, then - yeah - I would say that they don't know what they're talking about. I suggested two possibilities - you only considered one. I'd have to see the actual quote.

Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my address with the letter 'x')

Yea, I wish I still had it. It was in the last (or second to last) issue of the Ford Times (or Ford Life or one of the Ford magazines you got when you purchased a new Ford auto. Thought the name was Ford Times, could be mistaken.)