No real answer.
They had 2 stands, 1 pushing Ultimate and 1 pushing 102.
A tech’ guy in the Ultimate stand would stand by Ultimate even though it has less RON’s, it has an anti-friction agent which he thought Shell didn’t (I now see it does BTW)
Also seemed to imply they use Scoobies for a lot of their testing.
One guy of the several Sales people on the 102 stand just said he’d use Shell. The others wouldn’t comment. Couldn’t get a definitive reason why other than the higher RON’s and being used in a JAP import where the RON's are higher.
But 102 is the next one up still.