I put in a fitch fuel saver one time. It did give me exactly 7% better economy, and I took it off for a month and continued documenting economy, then I put it back on and the 7% came and went with the fitch. It cost over $400. Anyway I sold the car and didnt remove it, I wish I had now because the new owner would not have known. The good news is you can easily get 7% by keeping your engine tuned properly, tyres hard and driving with lighter shoes.
As for the fuel saving devices in general I think its a load of tripe and I am very skeptical.



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