This is featured on the Energy Star website:
Quote:
Compact Fluorescent Light Bulbs
If every American home replaced just one light bulb with an ENERGY STAR qualified bulb, we would save enough energy to light more than 3 million homes for a year, more than $600 million in annual energy costs, and prevent greenhouse gases equivalent to the emissions of more than 800,000 cars.
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I'm not very numerate, but I did some crunching. They say these bulbs use 75% less energy than incandescent bulbs. There are around 112,000,000 households in the U.S. (Correct me if I'm wrong.) If they were to replace even one 60W incandescent bulb with 13W fluorescent bulbs (which offer equivalent lumens), it would mean 5,264,000kw in energy savings. Calculate that per hour.
Here, I found 100 cubic feet of gas is equal to 28 to 31 kWh (kilowatt hours). So, 1 kWh is equal to at least 3 cubic feet of gas.
[edit again]
Now, if a household can save 47w per hour, isn't this equal to 0.141 cubic feet of gas per hour?
This is around 16,000,000 cubic feet of gas saved per hour in the U.S.