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In the U.S., at least where I've lived, the meter measures gas in cubic feet. http://en.wikipedia.org/wiki/Natural_gas#United_States

It seems to vary which part of the country you're in, oddly. Some use BTU, some use therms, some use cubic feet.

http://www.aga.org/KC/ABOUTNATURALGAS/ADDITIONAL/Pages/Howto... - looks like it depends on whether they choose to measure volume or energy content.