[eftpotrm]

BMW tried that with the i3, it wasn't particularly popular. An engine, fuel system and a generator are all relatively complex additions compared to just putting the same cost and vehicle space into more batteries, and the public charging networks are definitely up to the task by now (having been EV-only for almost 5 years now).

[thmsths]

I've ridden in one and this was basically a case of "you get the worst of both worlds". The engine was small and running at a constant RPM, leading to an annoying noise in the cabin. The range extension was not particularly huge. Worse, when we did eventually run out of battery on one trip, the range extender was unable to recharge the battery after refueling the car, forcing us to scramble to find an available charging station with the car on the tow truck...

[thijson]

I've been driving one for a while. On the trips I've driven, even on the highway, the engine was able to keep up with the energy draw. I think it's around 60HP. If I'm on a long trip, I'll start the engine once I reach 75% of my battery capacity. That gives a significant buffer for the engine. It's a serial hybrid.

[Tagbert]

Yes, the Volt was a better balanced version of that. It had a longer EV range and the range extender was larger. It was much less likely to need the range extender and when it did, the larger (1.4l) engine was no more noisy than any gas engine.

[supportengineer]

>> the range extender was unable to recharge the battery

Could you expand on this? What was the actual problem? For example, did the range extender start and run? Did it put any energy into the battery at all?

[throw0101d]

> An engine, fuel system and a generator are all relatively complex additions […]

And yet that's what an ICE car is.

So a range extender (RX) should be no worse than ICE: in fact a little less complex because you don't have a gear train and transmission.