Quote:
Originally Posted by XC3LLR8
That's the general recommendation.
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In other words you are shooting for an E30 mix, assuming the 13.7 (US) gallon capacity of the M240
Now since E85 ranges from 100-105 octane, that calculates out to 94.9 octane with 3.6 gallons of E85 of 100 octane, or 96.2 octane if the E85 is 105 octane.
So roughly speaking, to summarize, with 3.5-3.6 gallons of E85 (in a full tank with the remainder of 93 octane) your range of running octane will be between 95 and 96.
If someone wants me to run the numbers with a 91 or 92 octane base (instead of 93) let me know.
Oh yes, i believe (but not verified) that an E30 mix is about the limit of what this BMW system can handle.