150 gallons is the minimum delivery around here. When I worked for a gas company, they also had oil delivery and service. Degree day information was used and they could calculate extremely close for both auto delivery of oil and propane. That's why it's important to let them know when you add another heat source such as wood or coal OR add another fuel burning appliance such as gas logs, dryer, water heater...... You can end up running out, or they come back too often and put you on "will call" so it's up to you to call when you want fuel. And wait................
Us guys on call over night would have the service truck and drift propane into a customers tank in an emergency until the delivery bulk truck got to them "next day".
They probably had enough for the minimum delivery or help with one of the many assistance programs. Then their ship came in, or someone else helped.
My neighbors dump 5 gallons a day in their tank buying off road diesel at the station. They must partake in mind altering substances, because I was asked to go over and bleed it once to start their burner after running out, and THE FUNNEL was left in the fill. With it POURING outside !
I did not advise them to get a wood stove.