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      02-11-2012, 12:03 PM   #6
BEAR-AvHistory
2020 Z4 M40i - 2022 M4C Convt
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Drives: 2020 Z4 M40i - 2022 M4C Convrt
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Quote:
Originally Posted by 07_335i_AW View Post
Those octane levels look correct. The way to calculate it is:

Race gas oct. rating x Gallons of octane + pump gas oct.rating x gallons of octane.

Total from above / (divided by) total gallons in tank = octane rating

soo for .. 1 gal race/16 gal 91= 91.5 broken down is 100x1 + 91x16 = 100+1456= 1556 /17 = 91.5

Hope this helps
+1 I use the same system to bring NC standard 93 up to 95 octane with a 93/100 mix
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