As the proud owner of a gas guzzler, I am especially interested in the upcoming EcoSpeed app. The EcoSpeed app is a soon-to-be Android and iOS app created to help get you from point A to point B using as little gas as possible.
The EcoSpeed app maps out the most fuel-efficient route based upon the starting and ending destinations you input. The app factors in things such as street lights and stop signs to find you the greenest route possible. Once on the road, the app can detect how fast you're going and measure that against the speed that will get you the best fuel economy. The app is not available for download yet, but it should be out sometime soon and will be priced at the incredibly affordable price of free.