Fuel economy devices?

snow2

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Been eyeballing these things with the cost of fuel today ,couple different types one plugs into cig lighter my truck doesn't have the #1 thingamabob plugs into vehicle ECU port

Any input first hand knowledge appreciated. I know just another hoax or are they? I remember not long ago we were down loading chips that offered 3 stages of performance from fuel economy to Hp enhancement, at the time auto makers under federal/obummer pressure down sized the big 3 powertrains Hyper tech and Bully Dog were a hot commodity gasoline engines utilizing Hyper Tech chip on stage 3 boosted HP up another 105 Hp it was a noticeable difference until newer trucks with this chip were blowing engines, melting cylinders causing engines to sieze voiding warranties if chips were detected,most guyz I knew with this chip having engine issues would unwind the chip b4 dealership involvement worked until auto manufacturers caught on, Bully Dog chip was the #1 chip for ford diesel same deal. This shit always comes up during troubled times.
 
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