More people are going to kill themselves and others because of this. Most cars lose power brakes and power steering when the engine's not running. Some people might turn the key too far and lock the steering wheel, causing a crash! Most cars don't have manual transmissions. So you save a little at the pump for what? To pay for a new starter? To pay for a new key cylinder and keys? To pay for the mpg meter? It's probably illegal too! Imagine stalling when you need to get out of the way of oncoming traffic. Hypermiling is such a BAD idea (the way it's presented here)!
Following a few simple guidlines will give you a majority of the savings.
1. Don't drive aggresively. No full throttle starts that require a ton of braking to slow down.
2. Don't drive too fast.
However, the great part about this episode is the advice on road rage.