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I have used the fitch in 2 of my gas cars and have seen pretty decent gains. My Mercedes with a 2.3 liter gas engine showed a 3mpg gain on the highway with noticeable improvement in performance the same for my 4.0 liter explorer. My neighbor swears that his Pontiac went from 22 mpg highway to 28 with the fitch. Each of the gas cars took a while (about 700 miles) to see any changes. Last month I bought an E350 with a 6.9l diesel so I will put a fitch in it and see how the diesels go. Everyone here in my town that has put one in their car has been impressed. So I can't wait to see one in my 6.9.
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