My local company comes by once a month from Oct-April, and not at all from May-Sep, unless they're called. I have a 500gal tank, and they pump enough each cold-weather month to bring it up to full. I dunno if that's standard, or just the practice around here. I usually go through 125+ gallons per month in Dec-Jan-Feb, less in other months.
I’ve got a 500 gal tank also. Since they only fill to 80%, that means 400 gals. In Aug, the co-op I get my propane from usually runs a ‘summer fill-up’ discount program. A dime discount/gal. That’s when I fill up. Then in Dec- Jan, whenever my neighbor across the road has a delivery, I have him top mine off. My neighbor’s tank is only a 250 and they don’t burn, so they get a couple of deliveries/yr.
Last I heard (May?) propane was $3.00 here...how much by you?