Jon, I understand that RVs here typically get around 7 miles to the gallon- of course, that is not the imperial gallon.

Cars' mileage varies a lot. The last car I had got around 40 miles to the gallon- the least I ever got with it was 34 to the gallon but that was going over mountains with 4 people in the car. That was a Plymouth Champ, (since discontinued) made by Mitsubishi.

Nowadays, (that was 14 years ago) I gather most vehicles get around 15-17 mpg. And SUVs get less than that. But again remember our gallon is smaller than yours.

Looking at it that way, the difference between our mileages doesn't seem all that great.

I once drove a Peugeot on the job that burned diesel. It got less than 30 miles to the gallon, which made it cheaper than gasoline but smelled worse.

And again, remember that in the western half of the US train service is not that great; most people don't have that option.

Ebbie