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(#of gallons x 116oct)+(#of gallons x 93otc) divided total gallons gives you your octane.

So for example, if you mix 5 gallons of C16 and fill the rest up with 93 would equal:

5x116 = 580

13.5x93 = 1255.5

580 +1255.5 = 1835.5

1835.5/18.5 = 99.22 Octane.

I use 18.5 because thats the capacity of our gas tanks.

I hope that helps. I use the calculator on my phone all the time to calculate octane when mixing on the fly. :)
 

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drift tt 23 said:
im just guessing that a 5 gal. of c16 with 5 gal. of 93 would net around 115 octane and be able to run 28 psi on stock ecu.

5 gallons of 116 + 5 gallons of 93 only yields 104.5 Octane.

So I would think twice about running 28psi on that ratio. Try a higher ratio of C16 to pump.
 
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