Multiple choice

Which of the following is the final type of octane rating?

  1. Motor Octane Number (MON)

  2. Research Octane Number (RON)

  3. Anti-Knock Index (AKI)

  4. Observed Road Octane Number (RdON)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The final type of octane rating, called Observed Road Octane Number (RdON), is derived from testing gasolines in real world multi-cylinder engines, normally at wide open throttle. It was developed in the 1920's and is still reliable today. The original testing was done in cars on the road but as technology developed, the testing was moved to chassis dynamometers with environmental controls to improve consistency.

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