Aboard One of the Biggest Container Ships in the World | The New York Times

https://youtu.be/MvF2KWbi7eg

4:13 She burns 100 tons of fuel a day. (!)

That's about 30,000 gallons. 

https://onlineconversion.vbulletin.net/forum/main-forums/convert-and-calculate/8194-partner-horizon-fuels

At $300 per tonne, that's $30,000 a day for fuel. 

"bunker prices for fuel oil are between $309 and $340 per tonne, depending on where you are in the world."

https://www.quora.com/How-much-does-it-cost-to-fuel-a-cargo-ship

(On that quora page, he calculates a cost of $130,000 a day for the thirtiest ships, and $0.7M to cross the Pacific in such a ship.)