this post was submitted on 23 Dec 2023
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Higher octane resists detonation (knocking). It's required for engines with high compression ratios. Turbocharged engines are susceptible to detonation, so they'll often require higher octane fuel.
My car has a 4-cylinder turbocharged engine. The manual says I can use standard, mid, or premium. The engine has a "knock sensor" which reduces power (basically by turning the turbo-charger down/off) if it senses detonation. If I use premium gas, the engine will use the turbo as much as possible, increasing gas mileage (according to the manual). The increased cost isn't worth it to me.