For the last few days I've been wondering if maybe hybrids should have a light at the rear that would start blinking when the car is in "auto-stop" or Assist mode. It could have "EV" electric-vehicle mode or "ZE" zero emissions mode on it... then I figure it would be too smug... but maybe not.
A lot of cars have useless plates and markings, like AWD, 4-Matic, ABS, Diesel, etc. so why not ?