• addie@feddit.uk
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    5 days ago

    Bear in mind that the gallon we use is different from the US gallon, too:

    • a UK gallon is eight (imperial) pints of 20 fluid ounces, so 4.54 litres
    • a US gallon is 231 cubic inches, so 3.79 litres

    The reason that I thought American car fuel economy was so terrible as a child is partly because UK mpg is +20% on US mpg for the same car on the same fuel. But also, because American car fuel economy is so terrible.

    • bitwaba@lemmy.world
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      5 days ago

      Don’t forget that the UK fluid ounces are different (slightly smaller) than the US fluid ounces as well

      20 UK fl oz = 19.21 US fl oz

      • ZeffSyde@lemmy.world
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        5 days ago

        Holy crap, that’s why craft beer tall cans are different from 16oz tall boys here in the states. I’d always wondered why the were 19.2.

    • anomnom@sh.itjust.works
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      5 days ago

      Brits also think our gasoline is crappier because we use a different calculation for octane, (R+M)/2 instead of RON.

      So 90 RON is actually 85.9 in the US. And in most of the country the minimum is 87 (R+M)/2.

      93 Premium is like 98 RON. And race gas 100 is like 105 RON.

    • dankm@lemmy.ca
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      5 days ago

      It’s weirder when you look at Canada vs USA. Mileage here is usually written L/100km, but back in the day the cars were exactly the same but the mileage in Canada was better because the the US gallon is only ~83% the size of a proper gallon.