Good point on the fuel expense.
Our typical 4+ month "Summer Sojurn" approx costs:
Fuel: $1800.00
RV Park: $3600.00
Food: $1800.00
Golf: $3000.00
And worth every penny.
Of course from that we subtract costs we would be incurring even if we never left home. So the fuel is kind of incidental to the whole summer thing. While it's nice to know what the fuel cost would be for budgeting purposes, the MH experience does have some expense associated with it. IMHO, the fuel cost won't change significantly if you have a MH, TT, or 5er....they all come in at roughly the same.