Welcome to GenVibe. Good year and trim level you got there. I too have a 2004 Vibe GT (Fusion Orange) and it's now my daily driver for the past year & a half. I cheat every now & then and put regular in the Vibe and other than low load loss of performance, you should be fine. Do treat the car to some premium every once in awhile though. It will run better. With fuel prices so low right now, it's the perfect time to pay for premium. Costco a few days ago had premium for 1.89 so I gladly filled my Vibe up at that price
Also post some pics and fill us in on other feature your Vibe has. Oh, finally "location". Update your profile for us. Thanks & visit often .