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I doubt the people who are honking for going slow are going to stop and think, "wait, they're getting 50MPG by driving slower?" Rather, they'll probably just honk anyway, and wonder "why the **** do you have an LED dislpay outside of your window, you jackass".
A bunch of people have bumper stickers, or other larger stickers on their vehicles that show their average MPG. That's probably better than having an LED outside, as having something flashy showing on the outside of the car is illegal in most states.
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