Audi started making this an option in 2008 (2007?) on their A8 line and was followed by Fisker and Toyota on the Prius. i don't think any of them have it as an

Audi started making this an option in 2008 (2007?) on their A8 line and was followed by Fisker and Toyota on the Prius. i don't think any of them have it as an option any more. It's just not effective enough.