Marbles

Ground speed limited to forces of the earth’s crust and circumference of the globe itself. This will be 30 miles per hour.

Max air speed capable above super sonic, breaks the sound barrier to get past the barrier of energy wastage through the output of sound from the engine. Hence it’s super sonic.

Fuel and efficiency are crucial so they only work with benzene. No other compounds other than aromatic hydrocarbons will work.

Nero.

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