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Bill & Dave,
I may have been too conservative on the AC and TV (no specs in front of me), but I also didn't account for other ancillary equipment such as the converter, fridge, any AC lighting, DVD, etc.
I have absolutely no doubt that your smaller KW gasoline generators are more fuel efficient, but the question posed was the Onan 5500 LP which is a large displacement twin (653cc) engine, as big as some motorcycles. Given the no load consumption of 1.8 lbs, the best possible duration would be 33 hrs across both LP tanks assuming nothing is on and no additional appliances are using LP. Realistically I think 16 to 20 hours would be about it for the 5500. The LP egens are not as efficient as the gasoline either, whereas the LP system consumes 0.79 gal/hr half load and the same generator gasoline model consumes 0.60 gal/hr.
Brad
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