An evaporative emission control system for a vehicle comprises a scrubber containing an activated carbon fiber material selected to adsorb butane and/or pentane isomer vapors in low concentrations in air passing through the scrubber and to desorb the adsorbed butane and/or pentane isomers without being heated. A method for reducing bleed emission to below about 3 mg per day uses the scrubber.

 
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> Arylcarbonylated vapor-grown carbon nanofibers
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