<VV> Kind of gas for 62 Monza 110

[A.J. Stone]

Would appreciate guidance on what kind of gas is best for a 62 Monza 110.
The owner’s manual calls for premium, which I am assuming is 93 or better octane.
I can only find 87 octane ethanol free gas, but no premium ethanol free gas.
Would it be better to use the lower grade ethanol free gas or should I use the premium gas with the ethanol additive??
Thanks 
AJ 

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