(In reference to your post in the FS thread)
The problem is that we don't have 93 anywhere around not only where I live, but anywhere in the region.
In theory, the 91 we do have available is adequate, but I know from data logging that the 91 results in a mild amount of STK, so basically we're on the edge.
After I have one more conversation with Dusterhoff, I'll make a decision.