I feel like I am in good company. I feel and do the same as most of you above, every day.
ANYONE can drive "pedal to the metal". Not everyone can drive to get good fuel economy.
I need to break out the window crayon and mark my MPG on the back window...The cops might not like a rear LED/LCD display on the back window. BUT they do make license plate frames that you can change the messages in LED.
Just an example, not a promotional thing:
Scrolling LED License Plate Frame » Coolest Gadgets