Propane advocates now chime in

Ethanol, natural gas and now propane

With 11 million propane vehicles already on the world's roads today, Brian Feehan, vice president of the Washington-based Propane Education and Research Council, believes that about 10 percent of US auto fleets could also be converted to propane powered vehicles.

"That technology, we feel, is going to be around for a while now," he said at a recent event in Central Park touting the future of the fuel in the automotive industry. "We've perfected it."