I bought one device that would save me 25% on my mileage, and liked it so much, I bought another, slightly different one that would save me 40%.
WOW, with this working so well, I found one more for 15% and the last one was good for 25%.....

EVERYTHING went great til I drove 10 miles down the road and the tank overflowed.......

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87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100