Speciated Measurements and Calculated Reactivities of Vehicle Exhaust Emissions from Conventional and Reformulated Gasolines

Exaust emissions were characterized from 19 vehicles tested with two fuels: a typical Los Angeles premium gasoline and a reformulated premium gasoline. The reformulated fuel had lower vapor pressure and distillation temperatures than the reference fuel and contained 11 vol% methyl-tert-butyl ether (MTBE). Total volatile organic compounds (VOC) emissions were reduced with the reformulated fuel by 6% across the 19 vehicles, but aldehyde and alkyene emissions were increased