+3 tune premium fuel?

[DKL]

I just installed the +6 tune with after filling up with 93. I plan on reflashing to the +3 tune for the winter; should I continue to run premium, or would it make any difference? I ran 89 before reflashing. My Civic is stock otherwise.

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[gtman]

Hondata has said in the past you can run that tune on 89, just don't expect the advertised power. Also consider incorporating "Hondata Mode" where you have a dual tune setup. Econ button on is stock. Econ button off is + 3 psi.