This is what the monthly residential gas bills in Philadelphia look like. In particular, this is the portion Philadelphia Gas Works asks you to detach and return with your payment. Like most utility companies, they'd like you to fill out on the form how much money you are enclosing. But look at that Amount Enclosed field: they provide individual boxes for each digit in the number, including eight boxes to the left of the decimal point. This leads to a series of conclusions:
PGW thinks you might need eight boxes to fill in all the digits of the number of dollars you are sending them.
PGW thinks you might send them at least ten million dollars.
PGW thinks you might be using, if my calculations are correct, about 54 million cubic feet of gas each month, which is the amount of gas that all of Chevron's wells in China pumped out each day in 2006, and which is enough to fill all twelve of the warehouses of Nordic, a major regional cold-storage company.
I'm not saying there aren't customers that don't ring up ten-million-dollar gas bills each month in Philadelphia. I'm just wondering how many that do have to fill in the boxes on the little form before they mail in a check.