I used to have a "48 MPG" sticker on my car, but I ended up removing because I felt kind of vain about it. However, now that I've gotten serious about hypermiling, I'm going to post my mileage again.
I'll probably just carry the windshield marker in the car and re-do it after each fll up; if nothing else this will motivate me to keep pushing to higher MPGs.
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