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natural gas vehicles(4)
alternative fuels(3)
automobiles(3)
compressed natural gas(3)
diesel engines(3)
natural gas(3)
alternative fuel(2)
costs(2)
economic factors(2)
emission control(2)
environmental economics(2)
gas emissions(2)
gas fuel purification(2)
greenhouse gases(2)
life cycle(2)
liquefied natural gas(2)
liquefied natural gas (lng)(2)
transportation policy(2)
trucks(2)
adoption barriers(1)
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