I was thinking maybe some sort of plastic clingy thing you could actually write your mpg in with a sharpie, and wipe it off and change it when you need to. That way it also ends up on the inside of the window of the car so it doesnt get messed up.
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'05 Outback XT, 19 mpg
BP-turbo 93 Festiva (long gone)
1/4 mile - 12.50@111.5
Best MPG - 36.8
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