Hybrid Assistant is a free Android App that helps you get the most out of your Toyota/Lexus Hybrid car.
Hybrid Assistant give you access to all the relevant HSD information with ease without all the complex setup of other ODB applications.
Hybrid Assistant may help you achieve better results in your driving: by looking at the internal parameters of the HSD engine you can optimize your fuel efficiency and reach driving Nirvana.

Note: this app needs a Bluetooth OBD interface to work.
Check the website for more info.