More than using a premium grade fuel one should run a premium brand fuel. Here in the US, on the west coast at least, Chevron is arguably the most 'premium' brand available and has enough detergent additives in the formula that additional additives are not needed. Burning fuel from the local 7-11 or Quickie Mart, regardless of octane rating, is putting your engine at risk of excessive deposits because of a lack of an adequate detergent package. Why do you think they can sell it so cheap? Granted, a tank or 2 (or even 3) won't usually hurt but a steady diet of cheap gasoline is flirting with disaster. It just isn't worth the savings.
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Proud to be a US Army veteran. AIRBORNE!
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