MPG-caps?

Apparently the mpg-caps are now available to the public. [link deleted] This site is says they save you 10-30% on the fuel mileage. I guess they've been used by the marines and navy for years. The are and octane booster and gas line lubricant on a tablet. Has anybody used these before? My uncle bought them from that site and is now he claims hes getting 28 mpg up from 24 mpg. I'm going to buy some.

Your uncle is mistaken. Scam, ripoff, whatever you want to call it, they don't work.

Sorry, but don't waste your money, and please don't link to sites like this. Its dangerously close to spam, especially when you put it in two threads of the same forum.