We will be boondocking at a festival for 3 nights, and planning to run the A/C during the night and possibly a couple hours during each day. Otherwise, we will run a fan and charge the camper batteries, and maybe operate a blender periodically. It will be my first time boondocking with a generator. How much gas should I estimate to need for this trip? We won't be too far from town to go buy more when needed, but I just wanted to get an estimate of how many gallons would be needed for the trip.