Enabling Annoying Customer Performance

It seems that "hypermilers" - people who drive in such a way to increase MPG, are driving other drivers crazy (WSJ, 4/17/09 A9). The interesting thing about this is that car manufacturers are installing devices in cars that aid this kind of driving, such as Nissan's "eco-pedal", which provides the driver pressure-based feedback when stepping on the gas too hard. Additionally, customer education has sprung up to teach people about "eco-driving."