The DynoValve does work. I have had one on my vehicle for over 4 years. I put on over 28,000 miles per year. As soon as I put it on it increased my mileage from 16mpg to 19mpg. At $2.35 pg thats almost $700 savings per year. Thats almost $2800 in for years. Don't tell me it's a toy that don't work.
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