Here's the deal I have a customer that is heating his garage with a natural gas hanging unit heater. He is very concerned about his gas bill this last month. How can I find out how much gas this unit would burn in a 24hr. period.

unit heater 60mbh input,
48mbh output,
1.1137 gas pressure factor,
1.0058 BTU factor

Any help with this would be great.

Thanks, helgy