So, 100 AKI is around 100 octane?
It's 100 by the (R+M)/2 method, which is also known as the anti-knock index (AKI). As opposed to many parts of the world where research octane number (RON) is what's posted at the pump. It doesn't exactly correlate because there are different spreads between research and motor octane, but it's usually close enough.