Do you noticed what used to be 1/2 gallon size tub of ice cream now comes in 1 1/2 quart? 

It is probably better than raising price on the same 1/2 gallon size ice cream, except we are not eating less. Just the tub won't last as long. 

It would be interesting to know if the compilation of CPI accounts for changes in the container size. 

Just read an article about fuel cells in Japanese home. Basically, natural gas comes in the normal distribution system for home heating/cooking use is passed through a reformer, producing Hydrogen and Carbon Monoxide. Hydrogen is feed into the fuel cell for electricity. Carbon Monoxide combines with Oxygen to form harmless Carbon dioxide. Heat generated in the process is used for heating water.

Such co-generation equipment should provide higher efficient from source to home, and reduce reliance on the power grid. 

The only catch is the catalyst used in the fuel cell is expensive and only has a very short life (3-5 years). Much need to be done here.