I mean, really. The indignity!
But seriously: How hard would it be to put a display in every car like the one the Prius has, where you can get a real-time monitor of your mileage? Driving almost becomes like a game--how high can you keep the bar all time? Can I drive better in these next five minutes to beat the MPG of my last five minutes?
I wonder what kind of fuel economy would result from everyone's having a better handle on their consumption habits?
(Further questions abound: For example, how about a useful real-time monitor of your home energy usage? Seems like that ought to be standard, too.)