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Why do you have to use premium gas in your supercharged 2001 buick ultra?

There's no such thing as a "Buick Ultra" or a "supercharged 2001 Buick Ultra". It's likely you're thinking of a different car or model.

Here's why you might need premium gas in a car:

* High Compression Engines: Some cars, especially those with turbocharged or supercharged engines, have high compression ratios. Premium gas has a higher octane rating, which helps prevent knocking or pinging in these engines.

* Manufacturer Recommendations: Always check your owner's manual. It will specifically state the recommended fuel type for your vehicle.

* Engine Damage: Using lower-octane fuel than recommended can lead to engine damage in the long run.

To give you a better answer, please tell me:

* The specific model of your car.

* Whether it has a turbocharger or supercharger.

Once I have this information, I can tell you if premium gas is necessary for your car.