If your gas valve pressure is correct and put a timer on the furnace, you
should be able to come close with a little math. A cubit foot of natural gas
is about 1,024 BTUs. If you have an 80,000BTUH input furnace, and it runs
for one hour, divide that by 1024 to get the cubic feet.

"Churchill" wrote in message
oups.com...
I've complained about ridiculously high readings with virtually no
response from the gas company. Waste of time.

John Churchill
Builder and Cont. Ed. Instructor at Emory University
Author of www.renovation101.com