additives agricultureandenergy alternativefuels alternativefuelvehicles asia automobiles automotive butylmethylether carboncontent congresses dieselmotor electricautomobiles environmentalaspects environmentalaspectsofmotorfuels fuelconsumption gasoline hybridelectricvehicles motorvehicles petroleum prices refining renewableenergysources sparkignitionengines standards taxation taxevasion taxincentives tetraethyllead tp343 transportation unitedstates