[QUOTE=Mgtv53;325151]
Quote:
Originally Posted by dkoldman
If I have half tank with 85 octane can I fill up with 91 octane.. or 89 octane?
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Yes. If half is 85 and the other half is 89; then you have 87 octane.
This is really so simple, I always buy 87 if available, I buy the 86 or 85. If I am able to buy 86 or 85 I am over 3,000 feet.