I honestly think this will have about the same popularity as automatic seat belts did, which was one of the dumbest ideas to try to force people into being safe.
As other have stated, aggressive drivers will probably just turn it off or override it with their foot, if that's how it works. The driver is the one who has to want to save fuel and if he/she does, similar results could be had by putting an mpg guage on the dash.
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