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Originally Posted by JET
I believe it is like the article I linked to says, it is a placebo effect. You think you are saving gas, so you don't step on the gas as hard as you used to, etc. In that case it actually would work, although the device itself is not actually doing anything, it is your actions that are.
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I think that could be true. Today I put on on my friends Ford Expedition, I will see if it helps him at all.