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91 vs. 93

TyphoonFiST

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Rich-fizzield
#21
I don't have a tune but when I first bought my FIST I ran 89 octane- "mid grade". It is .50 more than regular 87. 93 octane, premium is at least .70 more a gallon here but when I changed over to 93 I noticed a considerable increase in performance and also slight increase in MPG. I will use only 93 in the car now.
Probably the Smartest thing I've heard this week!


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