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Just checked with the Costco in West Des Moines Iowa in my area. They have Top Tier 93 octane. The attendant said the alcohol content usually runs around 8%. He also said they add fuel system cleaner to the gasoline storage tank before emptying the tanker into the storage tank. The price of the...

What is the octane of the premium gasoline you run in that 1.5 liter turbo. The premium gasoline in my area is only 91 octane. I see some places have as much as 93 octane. Thank you.

The manual says to use top tier 87 octane gasoline. No more than a E15 gasoline. No E30 or E85. Also says to use a AC Delco fuel system plus cleaner if top tier gasoline isn't available. Says to add the cleaner to the gas tank at every oil change. E15 has a 88 octane which wouldn't be 91 octane...

Would E30 or E85 gasoline benefit this engine over regular 87 octane? Since this is a direct injection engine wouldn't E30 or E85 be a carbon cleaning benefit to this engine? Also help keep the fuel system and fuel injectors cleaner. Also wondering if the extra octane would increase the...