Originally Posted by
megan
Technically you can't have an Octane rating above 100, anything beyond 100 is called a "Performance Number",
You can get a research octane number beyond 100.
For the motor octane number when you reach 100% isooctane you cant of course mix more isooctane.
I’ve heard the ”Performance number” before but as often Ive also heard octane numbers above 100.