Also, if you don't completely FILL your tank with 93, you are running a mixture that has an octane rating somewhere in between. Longshot's advice to start with +1.5 degrees of advance is a very good idea in this case. (If you were "half and half", you'd be burning 90 octane gas.) Later, when you fill up again, you'll be a lot closer to a true 93 octane mixture.
- Jack
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