Natural gas consumption for my 1996-built, 2116-sqft, 2-story (with basement) home is surprising to me. It has a gas-powered furnace, a gas-powered 50-gal water heater, and a gas-powered dryer, yet last month usage was only 89 ccf. Keep in mind that this is a house with original windows, mostly with blown seals. According to Columbia Gas, a comparable efficient home (top 30% of similar homes) uses 121 ccf on average and the similar-home average is 138 ccf for last month. There is an explanation, I just don't know what it is.