I personally don't think there is much point to creating those type of labels. I quite often hear people complain because they can't achieve the EPA estimated mileage (and it it almost always due to driving habits); however, these forums are proof that most people can quite easily increase their EPA estimated mileage by 20-30% just with driving habits. Regardless of what you want to list as "extremely efficient," people are going to find a way to sabotage that efficiency, again, making the label moot.
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