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.
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
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.
To be fair though, your petrol is still insanely cheap compared to the UK and Europe.
