We traveled 1380.9 from MA to FL.
I spent $362.60 on the Class B Coachman Campervan last year for fuel to make the same trip.
This year I spent $65.05 for fuel. That's 18% of last year.
We need to factor in that fuel was cheaper this year. Today's gas costs are about 40% less than last year so in this years terms, if the Campervan made the trip this year I would have paid about $231.68 and that would be 3.5 times more than what I paid for the Prius gas this year.
I didn't try to get down to the exact difference but to do a comparison of the two normalized for the gas price change this year.
In either case I'm happy with paying less fuel as a presentage of my costs.
More on comparison between the two trips in the future.