octane

Does anyone know definitively where it is best to spary meth into a 5.4L with a TVS for higher octane? I can not find a post that can state for sure pre blower or post blower. Thank you in advance.

I just installed my Lethal OffRoad X & AED Base Tune Saturday, got it Datalogged for Sean Sunday and now apparently have bad gas? Idk. Says the octane of the fuel is low but i've never touched anything but 93 in my '13 GT. Could it possibly be that when I did the logs I only had 25 miles to...