I've been also wondering since i know that the best gas over in California is 93, and i've been wondering, what will happen if the RSX-S was to use a different type of octane like 87 or 89. Can someone please tell me what might happen to the car if it uses those kind of gas and also will it affect the car later on in the future?

 

shitty gas milage
and most likely will affect the car in the future....
stick with premium with ur type S...