What propellant mix is used by the Starship upper stage engines, differing from the Falcon 9?

Answer

Liquid methane and oxygen

The Starship engines utilize liquid methane and oxygen, representing a shift from the Falcon 9's propellant mix of kerosene (RP-1) and liquid oxygen.

What propellant mix is used by the Starship upper stage engines, differing from the Falcon 9?
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