If you’re saying the generator remains mostly unused you could just leave it out altogether, sell the car even cheaper and just let people rent cars with longer ranges for their longer trips once or twice a year. A range extender doesn’t make sense if it’s “mostly unused”. It only makes sense if it’s used. And if it’s used, it emits.

You can’t base your whole argument on just using diminishing words like “tiny” for your gas engines and that way suggest that they’re better for the environment. They. Are. Not.

Battery electric vehicles won’t “be better in time”, they’re better right now. Don’t buy into the fossil fuel industry’s propaganda.