Why is common fuel called Octane 95?

Press the buzzer # – “Fill me up with full Octane 95, please.”

What is Octane 95?

  • Octane (from the name Isooctane) is a measurement unit that determines how resistant gasoline is to self-ignition.

What does that mean?
If I refuel with Octane 95, the mixture contains 95% Isooctane and 5% Heptane.

Back in the 1930s, it was understood that a combination of high octane and low heptane is the best and most efficient mix for the fuel we use today. This ensures the fuel performs optimally while preventing premature self-ignition.