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I specifically bought a Subaru Legacy 3.6R over the GT because it only requires 87 octane. The turbo GT model would have needed premium and gotten less gas mileage, and only has slightly better HP/Torque. I always use regular. Only need higher octane gas for cars that require it, mainly supercharged and turbo boosted cars, or cars that have been "chipped" to burn the high octane gas appropriately.