I do not know whom your post is directed but I have noticed zero in acceleration of 87 to 89 to 91 (or 93). All three, perform the same in my cars and even my gsxr. Un-treated fuels turn all injectors to crap, carbon up plug ends, carbon crowns of cylinders.
As I noted in other posts I can use Fp60 (or FP3000) and get better results WITHOUT using 91 and save money in various ways. This is not commercial on the product but from what I have read, seen, data, it works WITHOUT spending the worthless money at the pump.
Even if your car accelerated better on untreated 93, does that does not mean anything in engine performance, durability, MTBF etc.
I am not starting a debate here but 100 to 1, without any supporting data you are getting a placebo effect.