[mallrat]

Also a lot of stuff out there that truly deserves to be labeled "snake oil", many drivers and trucking company executives just lump everything in there and figure if the OEMs don't put it on or the EPA doesn't require it, it must be bunk. The Owner/Operators that are trying to save fuel and money have a lot of information to wade through, much of it false.

I think the consumer figures "if it worked, the manufacturer would install it" and the manufacturer figures "if the consumer wants it, they would demand it or install it themselves."