When I learned to drive, I was told it was more wasteful to turn off a vehicle and restart it than it was to leave it idling for a few minutes. I'm afraid I'm showing my age because thanks to efficient electric ignitions in today's vehicles, idling a car for just 10 seconds burns more fuel than restarting it. The facts are simple, and the solution is elegant!
Check out these easy-on-the-eyes figures, and share this with everyone in your carpool. If they're not into saving 40,000 tons of CO2, maybe they'd be into saving up to a couple hundred bucks a year in gas money.