We're one month shy of a full year on the road, but comparing our expenses the last twelve months with the previous twelve, we spent $600 less on the road than we did staying at home working. However, we replaced our car in the last twelve months; something I hope we won't have to do every year. Another caveat is that we're still paying for all of the upkeep on our condo while traveling, only we're getting rental income now that we didn't have before. Backing out the new car and the condo expenses, we'd have spent 30% less.
Our bottom line is that 52 weeks of "vacation" that took us to nearly as many destinations cost us no more than staying at home would have. Inexpensive? It is to us.
Retired early, traveling perpetually.