  In this paper, applicability of natural gas fuel for transportation as
compared to diesel is investigated. This study investigates a promising
technology for the heavy duty truck sector of transportation as a target for
conversion from diesel to natural gas. The supply of natural gas is limited so
we also verify the available domestic supply quantities both before and after a
fleet conversion. This paper concludes with an economic discussion regarding
Javon's paradox and the fungibility of natural gas as compared to that of oil.
In order to determine if natural gas can replace diesel for the country's heavy
duty truck transportation needs, the energy equivalent and efficiency of
natural gas alternatives should be compared to diesel. There are two
alternatives for using natural gas as a replacement for diesel; compressed
natural gas and liquefied natural gas.
