Natural gas use for transportation rose 26% from 2008 to 2011. That's the fact.
Here is the commentary. The increase in natural gas for transportation is much too slow to make any real difference to our economy, national security, and how we power vehicles. Gas usage for transportation is rising at a glacial rate from a very low base, even though gas was typically a dollar or more cheaper per gallon during the period from 2008 to 2011.
And the slow pace will continue, until and unless a rational program is launched by the states or federal government to build natural gas fueling stations to remove consumers' fear that a natural gas vehicle cannot be conveniently refueled. Political and policy failure blocks such a fueling infrastructure program and means that we remain hooked to expensive, dirtier oil and so put our economy, national security, and environment at risk.