Natural gas not flex fuel?

Biomass is not far cars

Ethanol. Many have called it the great boondoggle. To put it into cars, many claim, requires more energy than is gained, and a new life cycle study seems to confirm that belief.

Instead of using biomass to create bioethanol for cars, the study suggests the biomass should be used to replace natural gas for home heating, or for conversion into electricity. The displaced natural gas, the study suggests, could then be used for the transportation sector.