In the beginning of October, right before my busiest month on the water, I put my first tablespoon of BioPerformance in the gas tank of my 1997 Mitsubishi Montero. This vehicle has served me well over the past three years, and on flat rodes (not pulling the boat) where I can go near 55-60mph I would get 18-22mpg. In my home area that is full of hills, I get 15-18mpg.
Anyway, during the first tank, I was working almost daily and I still got over 20mpg pulling the boat (this is very significant to me.). The manufacturer claims that it takes four tanks using BioPerformance to get the full affects, but I noticed a difference almost immediately. Don't ask me how this stuff works, but it does, and the website has all the official reports explaining the testing process and the legitimacy of this product and company. Alot of my friends rolled their eyes when I said I was putting anything in my car or boat motor, but I assured them that the company has never had a claim against them and if I did, they would make things right. Fortunately, I fully believe in this product and have only seen increases in my motor's performances. Saving money on gas is sweet, especially considering it may be $4.00/gallon by next summer.