that was always the hard part with one EU2000. I had to make sure I stayed up till at least 10 so I could top off the gas so the heater could run until 6-7 am. It's also nice having two because if we go to a single day event we only need to haul just one. Mopars at The Strip we'll be running two and the big tank as we'll have the heaters and the a/c unit.... never know this time of year!