Ok so I'm thinkin about getting a tuner with a custom tune soon. if i do get the tuner i will most likely get some udps along with it. my question is what difference will the octane make in the tune? how much hp and tq will i lose if i stay with regular vs premium? i am trying to decide on udps and tuner or visual mods, and the hp and tq will most likely be the deciding factor. any help on the tuning question would be much appreciated!