I wouldn't necessarily jump to the conclusion that running a generator many hours, even for a/c during hot times, is going to use anywhere near 6 gallons... most any assumptions for even 1/2 load(much more than any a/c unit, or even multiple units, would need), is only 1/2 gallon or less per HOUR.... I think you'll find that the efficiency of these generators won't move the needle nearly as far as you fear - plus, the air conditioner doesn't necessarily 'run' for 10 hours straight.
We bought our son a used '07 FR Rockwood last month, and waited out the extremely hot afternoon, until midnight, to tow it home thru less traffic and cooler temps, with our Palazzo - we ran the Palazzo's air conditioner(s) for over 8 hours and hardly moved the fuel needle...
so, no, I don't believe even using the generator for 'hours on end' will come anywhere close to the cost of a simply 'overnight' at an rv park. With diesel as low as it is right now, it's even a much cheaper option than even before.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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