Propane Refills

Before I switched to an all electric B, I had four 20lb tanks that I used one at a time in my camper. I kept a chart of the 4 tanks and how much they weighted when full and after each outing and notes on the trip. So I knew were I was for the next trip. Repeat trips that I did every year I knew about how much LP I would probably used. Some trips I used partial tanks others I started full. I tried to get close to empty before refilling and more than one tank before I made a trip for refilling at a location that filled by meter. I stoped using one supplier when my records showed they consistently under filled for what they charged. I like several above only used the prefilled tanks to get better expiration dates. Using the above record keeping, I only ran out on the road once.