That is where the market is because that is where the single largest opportunity for a market exists. Commercial vehicles are operated as a business asset, and the opportunity for a commercial vehicle operator to realize gain from the use of an asset running on natural gas is quite significant, whereas consumer vehicles require a wide range of consumer choice in terms of types of vehicles. They require a very disparate fueling infrastructure network. The fueling infrastructure required to support a fleet of natural gas trucks, for example, is much less expensive.
On May 15th, 2012. See this statement in context.