In the US the BMW i3 range extender gas tank is software limited so the gas range is shorter than the ev range. That's the only way they could get it to qualify as an ev.

That does not seem bad! I was imagining something more generic, literally a mini trailer with a generator bolted on top, but this is sleek.

The motorcycle engine doesn't produce enough power so it can only do 40mph when the battery is dead.

That is less than ideal. Definitely does not fit my detachable range extender vision.