Originally posted by Blackfoot:
Pro guard is the name of the fuel additive that chevron makes, it cleans you fuel system and contains techron to protect it. You can buy it at your local auto parts store. It costs like $7.00 a bottle out here in CA. I always use Chevron. I've noticed i get at least 30 miles more out of a tank. Anyone else wonder if that whole "top tier gas" is just BS? I was thining about it and its hard to verify. I mean all Chevron, Exxon and the others have to do is say hey big three we'll give you money to endorse our gas. OK OK before I get flamed I just read that and I'm only saying hypothetically the big three for instance. After all they're all hurting pretty bad for cash right now.
I doubt that's the case, since the car manufacturers are basing the top tier gasoline largely on government emissions standards. And Exxon isn't even on the list 
Besides, if you personally have noticed getting 30 more miles per tank on Chevron gas compared to other brands, then that's evidence in itself that the top tier list is not BS.
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