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Smelly Buses

No. 17 bus running on bio-ethanol, photo by Arriva436

Earlier this year, Reading Buses switched over to using bio-ethanol on its No. 17 route, and now, whenever one of these buses passes, you get a distinct whiff of vinegar in the air.  Presumably this a result of incomplete combustion of the ethanol to acetic acid.  Or maybe the ethanol they use is already partly oxidized by bacterial action?  (Photo by Arriva436.)

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