Most drivers stand at the fuel pump and wonder: Is it worth paying more for 98 octane, or is 95 perfectly fine for my car? There is a lot of misinformation about “Premium” fuels, with many believing they provide more power or cleaner combustion. Let’s break down the science of octane ratings and what they mean for your engine.

What Does the Octane Rating Actually Mean?

Contrary to popular belief, the octane rating (95, 98, or 100) is not a measure of the energy content or the “power” of the fuel. Instead, it measures the fuel’s resistance to knocking.

When Should You Use 98 Octane?

Most modern economy cars are designed to run perfectly on 95 octane. However, you should reach for the 98 (or higher) nozzle if:

• You drive a high-performance vehicle.

• The manufacturer recommends it.

• You are towing heavy loads.

The Verdict

For the average daily driver, 95 octane is the most cost-effective choice.