I like this report. I don't believe everything on the chart on page 14. I have an extremely efficient new Navien propane combi-boiler. I am paying $1.45 per gallon of propane. #1 fuel oil is selling for $2.65 in my area. I pay 15 cents a kwh. I use my new mini-splits ductless heat pumps when the outside temp is above 32F. I still want to use enough propane to get get the reduced rate. I want to make sure I use at least 700 gallons of propane a year.This link is so good it deserves to be a couple of forums.