When we had our two 30# tanks filled (tt we had), we were charged a set price no matter if there was any propane in the tanks at all. And if I recall, it was was over $45 for the 2. I guess that was about $3/gallon and was a year ago. A 20# exchange tank goes for less than $20 here. That less than $4/gallon plus I can exchange 2 miles from the house, but need to drive at least 6-7 miles to fill up. Plus they had weird hours. That's another downside of places that fill up. More than likely, you can't go at 8pm to get a tank filled up.
