Jeez, I'd love to get 55 mpg, I just got 36 on a tank. I have the stick coils, will throw them on. Maybe it's my heavy hand? My bike is basically bone stock except for blockoffs and the rebar mod.
When I first got mine, I was only getting about 30mpg. I removed and cleaned the carbs, installed 2 min mod, stick coils, adjusted float levels, new carb boots. I think that is about it and I was extremely happy hitting that 52mpg. I don't quite get that around town, but always mid to high 40s.