We use reformulated gas in our state which uses more alcohol, one station attendent told me that plus and premiem were about the same or if you mix regular with premiem 50/50 it comes out to 90% premiem. All I know is with my GM LT1 5.7 liter I can run regular and hardly notice the difference due to V8s massive low end torque. In the Z the engine is more like a motorcycle very little low end torque and I noticed a real drop off in performance, so I just run 93 octane.
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The Blue Max
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