This past weekend I was able to finally use my Onan 6500 for more than just a trial basis...
I arrived at the track at 1PM Friday , it was 100* out..fired it up and fired up both AC's... Ran them about 5 hours, then dropped to only 1 , ran 1 AC all night , till 11am the next day,then I fired up up the 2nd AC and ran them till about 6pm.. Finally shut everything down around 6am Sunday...

41 hours total run time . . AC on the whole time , 2 AC's running about 10-11 hrs.

Went through 2 full 40# bottles and almost 3/4 of a 3rd bottle..

I will take that, at the end of the trip , I was happy with my decision to do the 6500...
Joe