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Petrol - Urban Myths

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    #32
    zilog_jones
    Registered Users Posts: 6,638 ✭✭✭zilog_jones


    I've tried the slow pumping thing the last few times I've filled my car - not surprising there was no discernable difference in fuel economy. It's got worse if anything, but I noticed my tyres had all gone down about 3-4psi since I last checked and it's been about 6000 miles since I last got the oil changed...


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    #33
    c-note
    Registered Users Posts: 434 ✭✭c-note


    PETROL is sold volumetrically i.e. by the litre.
    but its energy content depnds on its mass (kgs)
    you'll get more mass per litre when its colder (better value)
    and less mass per litre when its warmer (worse value)
    but the underground tanks in a station are kept at constant temp (or close enough to make no difference)

    as far as PETROL QUATLITY:
    YES petrol comes in varying qualities, but it dosnt make any diff to you're mpgs, i think there may be a minimum octane number of 92 in ireland (could be wrong on this) but 95 is normal, (not like in usa where i think you can get 85).

    In short i'd be far more concerned with how accuratly the pumps are calibrated. if i'm selling you petrol for 98c/L but my "litre" is only 970mls then thats really 101c/litre


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    #34
    Cool Mo D
    Registered Users Posts: 1,419 ✭✭✭Cool Mo D


    c-note wrote: »
    PETROL is sold volumetrically i.e. by the litre.
    but its energy content depnds on its mass (kgs)
    you'll get more mass per litre when its colder (better value)
    and less mass per litre when its warmer (worse value)
    but the underground tanks in a station are kept at constant temp (or close enough to make no difference)

    as far as PETROL QUATLITY:
    YES petrol comes in varying qualities, but it dosnt make any diff to you're mpgs, i think there may be a minimum octane number of 92 in ireland (could be wrong on this) but 95 is normal, (not like in usa where i think you can get 85).

    In short i'd be far more concerned with how accuratly the pumps are calibrated. if i'm selling you petrol for 98c/L but my "litre" is only 970mls then thats really 101c/litre

    True, and petrol pumps correct for temperature too, so you get a "standard" litre of petrol. The standard litre of petrol is based on a temperature of 15 degrees, so pumps correct to the equivalent amount.


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