At sea, mileage is measured in gallons per mile instead of the more familiar miles per gallon. As an example, the Queen Elizabeth II goes about 29 feet per gallon (just to remember, a nautical mile is about 6070 feet), so this ship would need more than 200 gallons for one sea mile.
You can also easily calculate the consumption per kilometre: 1 mile is about 1,61 km. So, the ship above needs roughly 125 gallons per km. Now you can play around and calculate the fuel consumption on longer cruises that are well over 1000 km.
That's quite amazing! Ok, have some fun.
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