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Here's how these work:
At 35mph, 3000rpm and 70% throttle, this device senses these 3 things and delivers a 200 volt jolt to your seat to shock you into pulling your foot off the gas.
 
sooo if I were to get 2 of them I could double my mileage!!!!!!!

not lol
 
Dang! And I paid $19.99 for mine. I bought it from Billy Mays on TV. I did get a 55 gallon drum of Kaboom free with purchase though for the extra cash. I just had to pay shipping and handling.
 
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