"Hypermilers," a weird subset of drivers obsessed with squeezing every last meter out of a tank of gas, will have a field day with this. The less OCD afflicted among us can also use the data provided to get an idea of how our driving style affects both the environment and pocketbook. Idling, driving stop-and-go, accelerating and braking too fast all have an impact on how much gas our cars consume. The EconoDriver brings that impact into sharp focus.