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if the car doesn't call for premium, and it's not pinging when you use regular, then you're wasting your money AND causing engine damage by using premium. You're wasting money because you don't need the expensive stuff. You're causing engine damage because you're getting a "dirty" burn which leaves deposits in the cylinder. Eventually those deposits build up, and when they get heated up by combustion, they stay hot until the next cycle, at which point they ignite the air/fuel mixture before the spark plug has a chance to. That causes premature detonation, or pinging, and you will then HAVE to stick with premium.
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