the 2 nd joint international conference on sustainable energy and environment see 2006 f 016 o 21 23 november bangkok thailand 1 introduction has been encountering crisis from increasing of price this is due to limitation our domestic resources especially fossil fuels demand every year therefore need import large amount for activities in transportation sector that consumes high level forecast policy planning office eppo ministry royal thai government found oil increases rapidly particularly diesel currently one most promising alternative fuel compressed natural gas cng which can be used vehicle instead order use as engine must modified typical there are two main technologies related modification dedicated ngv duel advantage saving rate but type only
