Does Premium Gas Damage Regular Cars? | MotorBiscuit

It’s not uncommon to see a manufacturer’s recommendation to fill luxury vehicles and sports cars with premium gas for the best gas mileage and performance. Because those models are designed with high-performance parts and systems, premium gas helps preserve and protect those components. And if you expect your sports car to rev like one, you shouldn’t put anything else in the tank. 

But what about a little role reversal? Gas mileage matters when you’re shopping for a regular vehicle too. But are there any adverse effects to pumping higher-octane fuel into your daily driver besides the notable increase in fuel costs?

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