Propane use. Now we use twice as much!

We've been on the road since February. When we started a five gallon cylinder seemed to last a month. Now it lasts a week! I know it's summer now and the fridge has to work harder but gee. Or maybe we have a leak. Not inside. We'd smell that plus there's the gas detector. Out near the tanks there is a slight odor but not more than usual. We have one of those valves that automatically switches between tanks when one is empty. I have tightened the hose connections at the tanks. Any usual suspects?