Just a quick update. Maiden voyage with the new toy hauler. Was mid 80's in AZ this Friday and Sat. Friday evening I fired up the Onan 5500. All doors closed and covers on. AC was on but not working very hard. Was watching a movie, DVD and I became that guy. Fell asleep with genset running. Woke up in the morning and had put 10 hrs on the Onan. Checked the fuel burn and was around 1/2 gallon per hour. Had it been over 100 degrees I would assume a higher burn rate.
Lesson learned run with cover on and compartment door closed.
Just thought I'd share.