On Sat, 26 May 2012 08:04:01 -0400, John H.
wrote:

"But today, truck manufacturers are embracing natural gas for everything from bi-fuel pickup trucks
like the Chevy Silverado HD to eighteen-wheelers that can burn natural gas either compressed, called
CNG, or super-chilled, called LNG."

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It's important to remember that one reason for the high price of
diesel is high road taxes, imposed largely because of trucks. If
large numbers of trucks end up converting to LNG it is only a matter
of time before taxation catches up.