91 or 93 octane, no difference in a car that requires 91.
In the last 2 months or so I've filled with (in no particular order), Mobil, Coastal, Sunoco, Citgo.
No difference between any of them, all are 93 octane. The Coastal and Citgo are always cheapest. Thank you Mr Chavez!
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SOLD MY Z MARCH 2018 - another Core OG moves on - new ride 2019 Z Corvette Grand Sport - no mods necessary but already have eyes on HFC and intakes LOL IT NEVER ENDS.
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