My good friend, Tai Stillwater, studied driver feedback for his PhD work and now as a post doc at the UCD Institute for Transportation Studies. He's got some good ideas and data to back up that people will change their energy use behavior in their vehicle if provided the right kind of feedback, even the most unlikely folks.
He's roped me into helping him develop an app for the US Governments new Apps For Vehicles Challenge. We worked on the presentation this past weekend of a simple but potentially effective app that will help game-ify fuel economy and give the driver of any vehicle feedback that will help them improve their fuel economy. It has a simple visualization of the underlying data so that end-users find it fun and easy to use.
Checkout the screencast below showing how the app will work.
Or click through the Prezi presentation.