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Alcohol added to gas???

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    #46
    Originally posted by cloudasc View Post
    Heres another funny thing, and i've noticed myself. Its better to fill up your gas tank at the coldest time of the day/night possible, there appears to be a higher energy content in the gas when its colder, and less amounts of energy during the hottest time of the day.

    I don't per say believe they increase the ethenol content in the winter, the ethenol content is static, the oil industries save money buy mixing in ethenol, so one would think they would mix as much ethenol as permitted all times of the year.

    A couple factors for lower mileage during winter. Your car takes longer to warm up, oils take longer to reach optimal temperature, and the oils in your engine/transmission don't lubricate as well while cold. Also with the cold denser air entering the engine, the ecu will dump more fuel to compensate.
    They blend, it's all about smog: http://www.slate.com/id/2098672/
    1992 Prelude S w/swapped H22A

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      #47
      My understanding is that fuel blends (ignoring anything to do with alcohol contents) do change to some degree according to the time of the year. In winter it's likely that the fuel will be blended with higher levels of 'light aromatic' components that are more volatile and thus evaporate more easily.

      This tends to make cold starting easier. In summer cold starting isn't such a problem, so lesser %s of lighter components are needed. I would expect this to vary from area to area, depending on local temperature variability.
      Regards from Oz,
      John.

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        #48
        Originally posted by johnl View Post
        My understanding is that fuel blends (ignoring anything to do with alcohol contents) do change to some degree according to the time of the year. In winter it's likely that the fuel will be blended with higher levels of 'light aromatic' components that are more volatile and thus evaporate more easily.

        This tends to make cold starting easier. In summer cold starting isn't such a problem, so lesser %s of lighter components are needed. I would expect this to vary from area to area, depending on local temperature variability.
        It does. There is a chart somewhere on the EPA's website (for the USA, anyways), because they control when and how much it is blended.
        1992 Prelude S w/swapped H22A

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          #49
          can we kill this thread ?

          -1992 CB7 EX w/H22 [sold 10/09]
          -2005 Legacy GT limited [current]

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