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Premium only. premium in my v8 92 camaro, premium in my 2001 z28 camaro, and premium in my 2016 v6 camaro.
My reasons are :
1. I dont commute 2 hours every single day
2. The difference in price is a small lunch every two weeks.
3. More advanced timing is always worth it
Plus, i'm sure in the icy cold (used to live in the north east) the fuel attracts more than it's fair share of water and i'd rather it dilute 93/91 octane than 87.
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