I ran the numbers. (Always run the numbers! Shout out to Dan Dobson.)
Guess what? Inexpensive cars that get good gas mileage are cheaper to own.
I was really hoping the numbers would show that the Tesla is comparable to other vehicles in monthly cost. Sadly, the numbers show the opposite. For now. As battery technology improves and gets cheaper, and as the Tesla price comes down, the Tesla will be the only sensible option.