The U.S. Energy Information Administration (EIA) has released data on alternative fuel transportation from 2009 to estimate the number of those vehicles being used in the United States.
The data was collected from suppliers about new alternative fuel vehicles, like diesel and plug-in hybrids, and conventional gasoline cars that have been upgraded. Both public and private fleets were surveyed for the report that is required to be compiled annually under the Energy Policy Act of 1992.
According to the report, in 2009 over one million alternative fuel vehicles were made available, a decrease of nearly 30% from 2008 because several manufacturers reduced production or halted models, most likely to do to the global recession. Most of the vehicles supplied to the market fell under the automobile category, with pickup trucks and SUVs coming in second and third respectively.
Over 800,000 alternative fuel vehicles are currently being used by fleets, approximately 6.5% more than in 2008. The majority of those fleets are comprised of ethanol powered vehicles, although compressed natural gas was a substantial percentage of fuel consumed. The full PDF report is available for download on the EIA website.