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In this video, there is a shot of the side of a P-51 Mustang.

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The side of the plane is painted with:

SERVICE THIS AIRPLANE WITH GRADE 100/150 FUEL. IF NOT AVAILABLE T.O. 06-5-1 WILL BE CONSULTED FOR EMERGENCY ACTION SUITABLE FOR AROMATIC FUEL

What does this mean?

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They are instructions for a compatible fuel substitute for 100/150 octane fuel per Technical Order 06-5-1 if AvGas is unavailable to the service crews in an emergency.

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In my opinion, it's a reminder that 1) fuel should be 100-150 octane, and 2) when not available, a gasoline rich in aromatic hydrocarbons (i.e. high-octane) could be used in emergencies, following the document T.O. 06-5-1.

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