Does anyone know how the GS's JDM "Harmonious Driving Navigator" works? It seems interesting.



http://lexus.jp/brand/hdn/index.html

It looks like the system uploads your fuel economy statistics to a Toyota server each night. The statistics can be viewed online.

https://lexus.g-book.com/alpha/hdnranking_gs350.html

 

Here is the brief description of this:
http://lexusenthusiast.com/2011/01/2...ing-navigator/
http://collisionconcierge.com/auto-b...ble-donations/