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I used to run 100 octane.... $8+/Gallon SUCKS....
You just can't daily a car on race gas simply because it costs too much. You'll get frustrated at some point realizing you've spent $500+ more dollars on gas than you would have using 91.
I lucky have E85 in my area, so I went that route.
Two maps is my recommendation if you want to enjoy a potent fuel every once in a while.
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