I know I will get no love from my West Coast brethren, but this is some bull right here
Good to know 91 runs fine, If I ever see it...91 is the highest. ( there are about 1 out of 100 stations which sell 100 octane, if you want to mix some of that with the 91, but you have to drive way out of your way to find one..) Then there's 89 and 87. I don't know anyone who pumps in 87 unless they have a 70s Chevy or, a rent-a-car .. 🤨
To this day, still my Favorite car ever! White, with dark cardinal red leather interior. 5 speed stick, Sport Evolution. Sunroof, rear wing with a flipped up trailing edge, Cellular One telephone. Back then was $0.45 per minute ANYTIME you were on the phone, lol. Denon aftermarket in dash pull out casette player with 6 disc changer in the trunk. That car was as smooth as butter, quick, and handled like crazy. Would give anything to have that one back. I ran a 50/50 mix of Avgas and pump gas which as I know now, was suicidalYeah, no problem with 91 for any car , IMO. When I added 4 gallons of 100 to 16 gallons of 91 , in my Porsche I could swear the engine was “singing“ a bit better, but it may have just been a negligible sound and better revv outcome, there was zero performance gain ( I timed it in a couple of runs with various octane grades in it ).
I know a couple of people ( also young at the time, they were both in their 20s ) who destroyed their engines by using full tanks of 100 octane and running the cars on the track like that ..just like you said, it took a while but eventually ..BOOM !