There's an EV indicator on the driver's dashboard that lights up when the gasoline engine turns off and you're moving only on electric power.
It's a kind of a satisfaction switch: it turns on and bang! You're instantly gratified.
It's a feeling that must be shared: everyone should know that!
So it's a shame that the EV indicator is only on the dashboard: it should be visible from the outside also.
Stick it on the rear glass and make it glow when moving on electric power!
So who's following you can say: "Damn, he's moving effortless while I'm here wasting my gasoline".
Nvidia: the way it's meant to be driven.
There's a thread about this on the Hybrid Synergy Forum here.