Word! I know exactly what ya mean. I'm currently in the process of rebuilding my fixed. It's been neglected since I've been out of school and purchased a full-suspension.
I personally haven't done any mods to my car due to the fact I just bought a house. To answer your fuel question though, I personally switch back and forth. I'll drive on a tank of regular gas and then next fill-up I'll use premium. Congrats on the new whip! Throw up some pics when you get a chance.