Here is how to figure it out using math and not emotion.
Fill up with 87 for several tanks and drive at least one trip of several hundred miles once at least one tank of 87 has been burned and refilled.
Do the same for 89 and then again for either 91 or 93.
Keep track of the mileage and the fuel cost, then determine how much it costs per mile
to determine the costs for each fuel. The next thing is to use that data to decide which cost you want to pay.
On my Gen7 3.6L V6 I discovered that 87 performs worse and gets less mileage, 89 performs best, and 91/93 doesn't perform any better or get better mileage but just costs more. I use 89 always.
PS: You might want to edit your sig...