"What if" is not an argument. What if there were a baseball-size nuclear generator capable of putting out 100 kW for 25 years and it only cost $1,000 and was completely safe? Your "what if" concerning the Leaf is not quite so far-fetched, but is probably just as unlikely. Basically, you are describing a Volt with a completely removable ICE subsystem. The practical problems are myriad. Who's responsible for maintenance of a shared generator? What if someone else is using it when you want to? Do you trust a generator (with all the complexities of an ICE) that someone else is supposed to maintain but might be too cheap to do so? Where does it go? In the cargo area within the cabin? Really? But if not, then the space where it does go is far less useful when it's not in. Do you take the unneeded batteries out for road trips? Talk about complicated! What you're talking about is as impractical as a car with switchable engines, and no OEM is ever going to build that for the public. Now you have a Volt. My bias is no secret: You're carrying around the dead weight and service-requiring complexity of an ICE when you don't need it, and for road trips, you're carrying around the dead weight of the batteries I have repeated often that I think such a car is a good match for a very small segment of the population. (Again, this is just my opinion.) Instead of carrying around several hundred pounds of complicated gas generator in my Tesla "for emergencies," (or for bad planning, since I know my range???) I carry a cell phone for emergencies. It weighs a few ounces, and the odds are ten thousand to one against my ever having to use it because I ran out of juice. More likely is that I'll need it because the car breaks down or gets stuck, and a generator would have done me no good at all. (Again, I have an EV precisely because I don't like gas engines! It would cost me less just to have the Prius and always drive it.) What the "emergency" generator would actually do is allow me to make road trips at lower efficiency than my Prius. And what the Volt can do is make road trips at lower efficiency than a Prius, while being an EV for trips under 35 miles. While range-extending trailers exist (and are impractical, dirty, and inefficient) they make less sense than using a car appropriate for the use. Rent a car if the need is seldom, buy a different car if the need is frequent. The notion that any OEM will build a car with a removable, sharable generator is laughable. And the hope of an reliable aftermarket conversion is more so. If that's your niche, the Volt is your car, and better REEVs will perhaps come along. But removable ain't gonna happen. Your laudable wish to not be a freeloader would be solved by pay-as-you-go charging stations. They could be coin-operated, credit-card operated, or subscription based. I believe there actually are such stations in existence. It could even be built into the parking fee in a lot where every space has access to a charger.