Totally informal testing, but yes, I have run a number of tankfuls with 93 and 87. "Seat of my pants" tells me there is some definite responsiveness advantage with 93. It feels and sounds like its working harder with 87. Of course, it all could be mental on my part. In the end, any difference is negligible in daily driving, so I've decided that 87 will be my choice going forward.
We use regular. Does anyone use premium? Has anyone tried both and can feel a difference?