The only thing I do different
I run a good quality of gasoline, and I think that's more important than whether its 87,89, or 93. We have some garbage gasoline here in Michigan, Wesco being the worst. Crystal Flash and some other are just poor quality gas.
I always run Shell, BP, or Mobil. Those always run perfect even though I use 87 octane. 90% of the time is Shell which I am a firm believer in its quality.
I used to have a back and forth to work car. A little 4 cylinder and it was starting hard and when cold you would get out on the road and step on it and it would bog down and then take off, you stop at a stop light the whole car would shake. Poor mileage and lack of power were common. I ran it down to almost empty and put Shell regular in it and that car change so much in 3/4 of a mile from the station, I just couldn't believe it, It didn't shake when stopped,it had more power, it started up quick when cold and never bogged down when you stepped on it. It was like I bought a new car. After that everything I own runs on shell gas.