FYI, 2019
We traveled from Upstate NY.
2 1/2 months
12,000 miles
$12,000
$3,800 went for gas

So we spent roughly about $170 a day. The biggest single category was fuel. When we were on the road we would spend at least $100 a day on fuel. We got 9 mpg towing a 25' Keystone Bullet. At first I cried every time we filled up, but after a while it was just another day at the pump.

When you consider that while we were on the road we weren't spending any money at home for groceries, fuel, dining, etc. I don't think the cost was excessive and with a little effort we probably could have got away a little cheaper.