My sister's fairly new 5500-watt LPG Onan on her trailer has this rating:
1.8 pounds/hour at no load
3.3 pounds/hour at 50% load
4.6 pounds/hour at 100% load
Running two air conditioners steady on a hot day will go through a 40-pound tank pretty fast. They were disappointed because it didn't last nearly as long as the sales guy told them. Checking specs showed he was full of it.
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