0, you'd never know the difference between mine and a non hybrid - they're identical on the inside and outside My neighbor has the exact same vehicle - non hybrid model - can't tell

What space is lost in the vehicle with both a battery, gasoline engine and I assume electric motor that must attach to the vehicle drive train?

That is what I have. I will admit it works VERY well - and IMO - is the absolute perfect/best of both worlds and nothing more than that is needed to save all of us from melting, or freezing, whichever the climate changers tell us will happen

I could see the benefit to a hybrid vehicle.   Honda makes one.  Not a plug in hybrid, but the battery is charged by the gas engine, and engine shuts off and on as needed.  IIRC.   I would never own a fully electric vehicle.  Living in the country, everything is 20 minutes away ( except the snowmobile trail, I can see this from my house👍)

My cousin says he won't buy another electric vehicle. Has Id4 now. He says about half the time all chargers are broken (yes not one but all) when he gets to charging station. He also had incidents where charger and car software can't talk, so not getting a charge either. CAA has had to bring his vehicle home on a few occasions. He says going to Ottawa in cold from his home in Toronto, can be a stressful experience. He says this is last pure electric he will own. Plug in electric with gas back up next time or just hybred.