Does anybody know those bottles of fuel system cleaner really work? I have heard they do and they don't.

yes... i would say get a bottle of seafoam at autozone or advanced auto and pour it directly in the gas tank for the best gas treatment cleaner you can get.. or get a bottle of stp gas treatment.... i use a bottle every 2 weeks...

I have use some before to (chevron techron, slick 50) but didn't notice much of a difference in fuel economy.

Berrymans B-12 works fine for me, been using it for years. Seafoam is also great stuff.

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