Why are US and UK gallons different?
The US gallon derives from the old English wine gallon (231 cu in) while the imperial gallon was redefined in 1824 as ten pounds of water — about 20% larger.
Convert liters to gallons and gallons to liters instantly. Supports US and Imperial gallons with a quick reference table.
US gallons = litres ÷ 3.785412. UK gallons = litres ÷ 4.546092. Litres = gallons × the same factor.
50 litres is 13.21 US gallons but only 11.00 UK gallons. A 10 US gallon fill is 37.85 litres.
The US gallon derives from the old English wine gallon (231 cu in) while the imperial gallon was redefined in 1824 as ten pounds of water — about 20% larger.
Convert both to l/100km. UK mpg figures look better than US ones purely because the imperial gallon is bigger, not because the car is more efficient.
Divide litres by 4 for US gallons; the result is slightly low. 60 litres → 15 estimated versus 15.85 actual.