air and radiation epa420 p 05 004 march 2005 user manual technical issues of greet for moves integration assessment standards division office transportation quality us environmental protection agency prepared epa by center research argonne national laboratory illinois notice this report does not necessarily represent final decisions or positions it is intended to present analysis using data that are currently available the purpose in release such reports facilitate exchange information inform public developments which may form basis a decision position regulatory action notation acronyms abbreviations bd biodiesel bd20 mixture 20 80 diesel volume carfg california reformulated gasoline cd conventional cg ch 4 methane cng compressed natural gas co carbon monoxide 2 dioxide ddgs distillers dried grains solubles dme dimethyl ether dmp dry milling plant doe department energy ef emission factor eia administration etbe ethyl tertiary