I found this from nasioc, have a read
"Hi there. Unfortunately, there's more to gas than just the rated octane when it comes to knock resistance. That means that all 91 gas, for example, is not created equal. We know this is definitely the case as it has been demonstrated here in the U.S. repeatedly via the poor quality Arizona, California, and Nevada gas.
We do not have very many Canadian customers nor do our shops tune very many cars running on Canada's gas. But, we have generally noticed that the 94 octane available there tends to react closer to our 91 or 91ACN gas. As such, generally you can see a lot of knock correction trying to use our 93 maps on the Canadian 94. That seems counter-intuitive, but it is what it is and we've seen it on multiple platforms we support (including Nissan GT-R). We do not have enough data to determine if that is certain regions of Canada where the fuel quality is poor or if there is some other pattern here.
Because of this, we generally recommend that you start with the 91ACN map on any Canadian fuel (of course the fuel has to be rated at 91 octane or higher). If everything looks good (via data logging) and you wish to see if the more aggressive maps will work with your particular gas, then try the 91 map next and then if that looks good, the 93 (assuming you are using 93 or 94 octane gas or higher). Keep in mind that even the 91ACN map has a nice increase in power and driveability over stock. Maximum performance will be had with 93 maps, but if your gas quality is not up to snuff (regardless of the rated octane of your gas), the 93 map will cause you to experience less performance and potential engine damage if you are knocking excessively.
That all said, the best option to optimize performance for your given gas quality is a custom tune. There are a number of protuners that tune for the Accessport all around the word. Some will even e-tune your car which is where you send them data logs and they make revisions to the tune based on the logs (and you go back and forth this way)."