David. I run it mostly on gas. I start it on gas, will leave it on gas during the trip and only switch to 120v once it cools down in the evening and over night (I usually will have at least electric hookup where I go)
Then, during the day, switch back to gas. Yes, running the A/C during the day really helps too.
My water heater is gas/electric too and I start it on gas and then switch to electric for the duration while camped after it's up to temp.
I meant the fans run on 12v.. The fridge does not have a 12v option, and I wouldn't use it anyway, since it has to work so hard to keep cool on gas!
Good luck! Mitch