A gas pump delivers fuel into a car.

Using This Octane of Gasoline Could Void Your Car’s Warranty

When I moved to the Denver, Colo., area from California, I was confused whenever I would pump fuel into my Subaru Forester. In Colorado, there are three different octanes to choose from: 85, 87, and 91. I was familiar with the last two, but what the heck is 85 octane? As it turns out, there’s a reason why that lower-octane fuel is offered here and the interesting part is that using it can void your car’s warranty.

Here is why you should avoid pumping 85 octane fuel into your car

A woman pumps fuel into her car

A woman pumps fuel into her car. | Justin Sullivan/Getty Images

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