blw2, I believe his is a 6,000 watt Quiet Diesel Generator, so not quite the same as a gasser or propane as far as fuel consumption. Should be much better.
However, specs show his motorhome has two 13,500 A/Cs, so probably could run close to 50% generator load when running.
On the good side, specs also show MH model comes with 1,800 watt inverter, and if wired to power TVs like it should, there is no reason to run a generator at all on a cool evening just to watch TV. If/when batteries get low, then start generator to recharge them, and hopefully this coincides with time when air conditioner is needed.
If 40-gallon rear fuel tank is available 100% for generator (and it may not be), there should still be plenty of diesel for 3 days. That assumes MH engine has a different (front) fuel tank to get him back to a fuel station.
I'd confirm how much fuel is available from rear tank to power generator and go from there. Sounds to me that it's all good as is.
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