"once you get past the range of a tank of gas or two."
This is like the folks who say flying is more carbon friendly than driving. It's wrong, you're comparing a vehicle running cost with one passenger vs a full vehicle normalized by its capacity.
No one flies 30 mi commutes.
Few drive 600+ mi empty or alone.
> Few drive 600+ mi empty or alone.
Is there a study on this? As I would have thought the opposite and would bet that the number driving alone is increasing as more people live alone.