BMW M3 Forum (E90 E92) - View Single Post - M3 tuned to 92 oct but refilling with 91...good/bad/no worries?

Route 16 · 12-21-2017, 05:04 PM

I’m getting ready for a road trip from WA state (92 oct) to CA (91 oct) since my motor tune is flashed to 92 oct.

Will it suffer mechanically? Knock? I’m not worried about mileage or throttle loss. I just don’t want to flash in between gas pumps when my wife and kids are whining to hurry up and drive.

12-21-2017, 05:04 PM	#1
Route 16 I got lei'd 921 Rep 7,618 Posts Drives: '10 E90 M3 Join Date: Sep 2011 Location: Dark Side of the Moon iTrader: (62)	M3 tuned to 92 oct but refilling with 91...good/bad/no worries? I’m getting ready for a road trip from WA state (92 oct) to CA (91 oct) since my motor tune is flashed to 92 oct. Will it suffer mechanically? Knock? I’m not worried about mileage or throttle loss. I just don’t want to flash in between gas pumps when my wife and kids are whining to hurry up and drive.
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