Not sure how much this helps, but my Generac Gardian QDP 7500 Diesel burns right at 1/2 gallon/hr with both AC's, everything else on the coach electrical running, plus charging our golf cart often. We go to a rally every year in June & run the generator consistently for at least 96 hours. Have done this the last 5 years with this RV & 1/2/gallon/hr every time.
I take really good care of the gene & do maintenance as manual says along with starting it every 7-10 days to run for 30 min under a load. Just ran it this morning and it fires right up and performs great.
