My 5500 Onan burns about 1/2 gallon an hour with no load up to just one AC. In the heat of summer with all the ACs running that will jump to 7/10 an hour. 70 gallons of fuel gives me 100 to 140 hours of run time or 4 to 6 days.
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Mike & Helen
2014 Voltage 3895 EPIC III
2013 Ford F350 CC DRW FX4