I have a car with the reverse feature. An ECO setting deadens the accelerator pedal removing the slight variations in pedal pressure you induce when going over a bump or just twitching your foot. Result is better fuel economy. You can still stamp down or make major changes in the pedal position, it is just the slight variations that get dampened out thus reducing the little squirts the fuel injectors would have made in response to the slight pedal pressure that is dampened out.
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