What does the first number in 100/130 relate to?

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Multiple Choice

What does the first number in 100/130 relate to?

Explanation:
The first number in an aviation gasoline rating like 100/130 is about detonation resistance. That first figure is the Research Octane Number (RON), which shows how well the fuel resists knocking under test conditions that simulate light-load, steady-state operation. Higher RON means better resistance to pre-ignition or detonation. The second number (the Motor Octane Number) covers detonation resistance under more severe, high-load conditions. So the first number specifically relates to detonation resistance, not fuel density, vapor pressure, or lean mixture performance.

The first number in an aviation gasoline rating like 100/130 is about detonation resistance. That first figure is the Research Octane Number (RON), which shows how well the fuel resists knocking under test conditions that simulate light-load, steady-state operation. Higher RON means better resistance to pre-ignition or detonation. The second number (the Motor Octane Number) covers detonation resistance under more severe, high-load conditions. So the first number specifically relates to detonation resistance, not fuel density, vapor pressure, or lean mixture performance.

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