The Harmonious Driving Navigator tracks each vehicle's fuel economy and issues points to drivers based on overall efficiency and performance in several other categories. Drivers can then redeem points to fund charitable organizations listed on the Federation of UNESCO Associations in Japan. The better you drive, the more money goes to the charities.
Lexus' Harmonious Driving Navigator operates under a similar principle to other fuel-saving systems, like Nissan's Eco-Pedal and Ford's EcoGuide, but goes one step further by monitoring driving habits and comparing each individual with a database of records to determine who is the greenest Lexus hybrid driver in all of Japan.
[Source: Lexus Enthusiast via Green Car Reports]