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To convert liters to US gallons, multiply by 0.264172. So 10 L = 2.642 gallons, 50 L = 13.21 gallons, and 100 L = 26.42 gallons. Note: the UK imperial gallon is larger — 1 UK gallon = 4.546 L — so always confirm which gallon is meant when comparing fuel prices internationally.
Car fuel tanks illustrate this perfectly. A European sedan with a 50-liter tank holds 13.2 US gallons. American gas stations charge per gallon; European ones charge per liter. Comparing fuel costs requires converting both the volume unit and the currency.
Did you know? The US gallon (3.785 L) and the UK imperial gallon (4.546 L) diverged because the US used the old English wine gallon rather than the Imperial gallon standardized in 1824. This 20% difference causes real confusion in fuel economy comparisons between US and UK cars.
Comparing fuel efficiency: a European car rated at 6 L/100 km translates to roughly 39 mpg (US). Swimming pool volume is often stated in liters in Europe and gallons in the US — a 50 m Olympic pool holds about 2.5 million liters (660,000 US gallons). Water heater capacities use gallons in the US, liters elsewhere.