91 Octaine in 4KSCQ?!

[Doug Johnson]

> > To add a bit of background, research  octane ratings are higher 
> > because they're derived from laboratory tests, under ideal and 
> > controlled circumstances.  Motor numbers are lower, because 
> they are 
> > determined under real-world conditions.
> 
> RON and MON are actually determined using the same equipment 
> in the same laboratories - the difference is that RON is 
> measured on free-running apparatus and MON is measured with a 
> load on the test engine.  Clever things, with variable 
> compression.  There's copious literature on the internet, 
> including a very good writeup on an Oxford University site.
> 
Thank you!