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    Known in France as essence, gasoline is expensive for those accustomed to North American prices. What do they call "unleaded"?

    Question #72676. Asked by momomomo0000. (Nov 27 06 4:19 AM)


    beeaydee

    		essence sans plomb (unleaded gasoline, literally, gasoline without lead)

    Nov 27 06, 5:44 AM
    zbeckabee

    		The mixture known as gasoline, when used in high compression internal combustion engines, has a tendency to ignite early (pre-ignition or detonation) causing a damaging "engine knocking" (also called "pinging" or "pinking") noise. Early research into this effect was led by A.H. Gibson and Harry Ricardo in England and Thomas Midgley and Thomas Boyd in the United States. The discovery that lead additives modified this behavior led to the widespread adoption of the practice in the 1920s and therefore more powerful higher compression engines.

    As beeaydee states, unleaded gasoline is gasoline sans lead.

    http://en.wikipedia.org/wiki/Unleaded_gasoline#Lead

    Nov 27 06, 10:19 AM

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