[sokoloff]

I’ve got no problem with taxing carbon-emitting fuel much higher than today.

If you tax three mile trips extremely enough, you turn a 4 mile roundtrip into around 15 miles of driving in a lot of cases. Need to go A to B to A which are 2 miles apart? Drive A to C (3.5 miles) to B (4 miles) to C (4 miles) to A (3.5 miles). Does that policy make sense in light of the obvious workaround?

Tax the fuel and you align the incentives much more closely and much more difficult to workaround in ways that work against your intention.