Like several others, I've had both bottles empty out with the crossover valve in auto. Probably not much of a problem in the summer, but we're full time and we do use the furnace quite a bit during the winter months when the heat pump/AC can't handle the chill.....for us, the valve stays in manual
Dan, Carolyn & The Bandit (1999-2015 RIP...)
United States Navy ('65 - '87)
2014 Cedar Creek 38FL
2013 RAM 3500 6.7L diesel DRW Crew Cab
"When you get to the fork in the road, take it....."