You eat everywhere, so cooking at or in in your RV cuts that cost by 80% the same as it would be at home over restaurants. Fuel, what would you spend at home to go about life?
Site fees - heres the big question
In the ARVC and Good Sam profile, that exclude membership and longer than weeklong visits, giving better rates to monthlies and seasonals, so as to give an overnight stay basis complicated by the average of on and off season rates, and further complicated by discounts that may or not apply,
Yeah, you could make it on $ 30-40/ night in nice camps if you travel in shoulder and off season, in the hinterland -- in the coastal states, add a lot. Double in any season.
If you dont need premium sites like pull thrus, are adventurous, it can be as low as free on public lands where you can subsist on your in house systems. For this xyou must know your tank and batteriy limits
$30 / is about the average nightly fee reported for private/ public in season partially seviced in the mid section of the USA