I agree with the above points. But as I mentioned I found it most useful for us when I was teaching my teen to drive. Because of the reduced response, she did not have to worry so much about the pedal feel during the early parts of our driving lessons.
I will add on long haul highways in Louisiana and Texas at 80-85+ mph I found no savings in eco vs comfort, at least as measured by the bmw mpg values in idrive. I do note a bit better mpg at lower speeds on local highways.
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