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The Booster, Scooter, and Rocket all have the green trails of propulsion bubbles.
What fuel do they use?

Is it:

• Gasoline, or some crude oil variant.
• Hydrogen
• Methane
• Pure Electricity (the exhaust is just superheated atmospheric gas)
• Kerosene
• Biofuel
• Nuclear Fuels
• Steam
• Water
• Sodium
• Potassium
• Other