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It may actually be easier to re-invent the wheel, or maybe I'm looking at a different project. Get one of those (relatively) big LED monochrome displays, and set it to say
"I'm getting XX.X MPG right now, how about you?"
Where it grabs the instant MPG from the MPGuino and displays it in the middle of the string. I'd mount it in the bottom of the back window.
Could also wire an input for brake lights and have it act as a 4th brake light too.
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