> The cost differential is enormous and completely changes the economics of cost per mile.

Which is exactly the point and why it is a bonus. You can't do that with a gas car effectively or cheaply. You won't pay someone to come and install a gas service in your home or apartment with the express reason for fueling your car. That you can with an EV and would get a game changing efficiency and cost reduction is an incredible bonus.

> Sure, but a full gas tank gets you further than a full battery.

That seems to be less of a factor today. Most batteries have hit the same or more range as comparable gas vehicles.

Some EV models already have ~600 mile range which is double their gas counterparts.

> We have friends with a long range Tesla that takes them days to charge on 120.

Sure, but that's to 100%. You can drive a car with less than 100% battery. A 120v charge can add as much as 40-60 miles range overnight. That's an average person's regular commute. The car might "never" be at 100% if the 120v charge is all it ever gets, but for some people they might never need a fast charge in an average week or even month.