I'm Dutch and we have the same Octane-system as Sweden I think.
Our gasoline octane ratings go from 95 to 98, and a few locations sell 102.
Propane's octane rating varies, depending on how the mixture is done at the pump. Overhere, LPG is a mixture of Propane and Butane. I believe Summer/Winter blends have the ratio change from 40/60& to 60/40%.
So it's hard to put a definite octane number on LPG, but the general idea is that most folks think LPG has a rating of 100-104 octane.

Seeing how the 11.3:1 CR engine in my daily driver can run without any issues on LPG, tells me the octane-rating must be good.