Just remember if the car manufactures start telling you it is ok to use 85, 86, 87 octane take it with a grain of salt. I believe they will tell you just about anything so, you will buy their cars. lol.
High compression is just that, a knock sensor to retard the timing will help but the mechanical attributes of the engine don't change.
I bought my crossfire to drive it like a sports car so, I'm sticking with a minimum of 91.
Regular may not hurt if you are going to baby your car around but then what was the point of buying it?