They fill 'em all the time. Especially boat tanks. I wouldn't bring the drum to the gas station, off loading it would be a mutherfuker. I'd just make a few trips with three or four 5gal containers and fill it where it would be stored. There may be fire codes about having tanks at home larger than X, but I have a place off property to store it.
try filling 6x five gallon cans twice a week, a 30 gallon dump truck and two 25 gallon pickup trucks.
We are loosing lawns every month because of the price increases. Whatever are we going to do with the illegal immigrants doing the jobs that nobody wants to do, that nobody wants done anymore. Last year we lost three lawns to robots.