octane number
octane rating

Gasoline is now generally available only in octane ratings of 87, 89 and 93.

Like the 601, the 605 was designed to run on "B4" fuel with an octane rating of 87.

It has led to technology to give gasoline a higher octane rating.

The following table lists octane ratings for various other fuels.

Gasoline sold in most countries carries a published octane rating.

Small amounts are used in some gasolines to increase the octane rating.

Lead has been used in gasoline since the 1920's as the cheapest way to increase the octane rating.

The higher a gasoline's octane rating, the greater its cost.

Problems caused by using fuel with a too low octane rating.

If your vehicle requires a high octane rating, the manual will tell you.