Imagine for a second that you want to buy a hybrid car. You haggle over a price with the salesperson, haggle a little more with the sales manager who inevitably appears, and finally settle on a price. While you're signing the papers, you notice one that stipulates how you'll drive your new hybrid. No jamming on the gas pedal the second the light turns green. No waiting until the very last second to stomp on the brakes. You will coast. You will become a hypermiler. Or else.