The Walmart pumps around here (I can't remember the name of the company that does their gas) all have the ability to put Additech engine additives directly into your tank, mixed while you pump your gas. I guess maybe I'm skeptical. How do I really know how much of this stuff they put it, or if it's put in at all? I can't see it, so that worries me. I'd rather pay more $$ for something I can see I guess.