My car is stock. I mixed one gallon 110 octane with about 2 gallons 93. I ran my timing as 18 degrees that night. It was almost freezing at night at 100 ft elevation (florida). I noticed more acceleration. Kind of like the difference between running a full tank of gas on a hot day vs. running on empty on a cold day. Sorry I don't have numbers. I did that about three times and didn't mess anything up except my tires.
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