This is right. I run the 91 Cobb stage 1 map and 93 octane gas just for peace of mind. I moved the pedal setting from +1 on the 93 map to the +3 on the 91 and it’s still a little less responsive. These things are really dependent on the higher octane. It won’t die if you run 87 on the stock tune but it will lose a bunch of power, response, and efficiency.If you want the rated HP and TQ of the motor you must use premium.