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      04-07-2019, 11:01 AM   #17
BEAR-AvHistory
2020 Z4 M40i - 2022 M4C Convt
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Drives: 2020 Z4 M40i - 2022 M4C Convrt
Join Date: Jun 2011
Location: Raleigh, NC - OIB, NC

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Quote:
Originally Posted by jcordier View Post
Thank you. I learn something new every day.
No problem, my bad for not checking your location spelling. DUH

Quick definition

Most common type of octane rating worldwide is the Research Octane Number (RON).

Another type of octane rating is called Motor Octane Number (MON).

Just to show its individuality ours is called Anti Knock Index (AKI)

AKI is (RON + Mon)/2.

Don't ask, have no idea why we do it that way. But the end result is our numbers on the pump officially (AKI) Anti Knock Index, but sometimes called Pump Octane Number (PON), just to make it more confusing, will always be lower then the straight RON octane number for the same gas.

Lived in England for a time so got used to both systems.
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2022 M4C - 2020 Z4 M40i - 2023 FORD Expedition XLT Max 4X4 400BHP - 2009 V-Star - 1998 Ranger 4X4 5MT - 1965 Cobra (R) 5MT - 2023 Jeep Wrangler Sport S 6MT

Last edited by BEAR-AvHistory; 04-07-2019 at 11:07 AM..
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