If there is no gas in the tank currently, just fill it full, then go camping, run the generator and keep track of how long you run it. Then, at the end of the weekend, fill the tank again. That will give you the gallons used and with the run time, you can then determine, based on your initial fillup, how many hours you should get based on the amount of gas used during the weekend.
Keep in mind that the fuel useage will vary based on the generator load, so if you use it for 6 or 8 hours a day and all you're doing is charging your battery and occasionally watching TV or using the microwave, you'll use significantly less fuel than if you're running two air conditioners.
Until you get a "feel" for how long you can go, just keep track of how long you're running the generator and how much gas you pump into the tank.
If you can access the underside of the RV and look at the fuel tank, there should be a decal on it "somewhere" that gives the dimensions and capacity. Of course, with an RV 10 years old, that decal may be "long gone".....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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