Hi, air filter has been replaced, no dragging brakes, the bike works well but i never checked the fuel pressure regulator. I had some FI issues caused by bad connectors and/or ground connector. Now it' OK and i have also poured a whole can of injector cleaner in the tank. The gas mileage was always the same - never seen a real improvement. JZH, i live in Bari, South Italy. Quite far from the classic "motor valleys" in the North, but we have nice roads here too 🙂