It's been since 2018 that I ran a tank of 87 through mine. It takes a few miles to get the timing bumped back up, maybe 20-50, but it is like seeing colors you haven't seen in a while. I know my lie-o-meter showed at least a 1-2 MPG drop on 87, don't remember the exact numbers. There is a youtube where they ran an ecoboost and assorted other cars on 87 and 93 and there was a clear difference, I think the ecoboost responded the best. It's not like running premium in a non-turbo truck, whatsoever. Forget what you know. The timing jumps are pretty significant.
I was a doubter too, but after running premium since new and having my wife fill up with 87 once, I could tell right away when I left the house, I immediately called her and asked what she put in it. Gasoline is apparently the only things a woman will cheap out on. It was like it's nuts were in a vice.
The MPG improvement probably doesn't make up for the cost difference, but is better. The driveability is much better.