FREE MPG! I would yell as I coasted down a mountain with the engine off. FREE MPG! I would yell as I coasted down a mile incline. After a few weeks my wife started to give me dirty looks when I would yell FREE MPG! I don't yell every time now, and my wife still gives me dirty looks when I do yell. But when you get FREE MPG! I can't help but show some joy by yelling FREE MPG! and it rhymes. lol.