This looks pretty good, what do you think? http://www.popularmechanics.com/technology/apps/a14566/voyomotive-gadget-idling/ Voyo with EcoStart – The world’s first plug and play Start/Stop system. Start/Stop is an anti-idling technology that saves fuel by shutting off the engine when the vehicle is stopped. Car manufacturers claim that Start/Stop increases fuel efficiency by up to 10%. The average Voyo driver who saves 20 minutes of idling per day will save hundreds of dollars per year, reducing gas consumption by 60 gallons and decrease CO2 emissions by over 1200 lbs. To use EcoStart, a driver connects the standard Voyo unit and two Voyomotive Relays.