Over the past week or so, my Spada just felt 'blunted'. It would still do everything, and didn't sound odd, but it's usually open-hearted joy in acceleration was lost, and it just seemed to slow down more quickly and require more throttle to get going. I checked the brake discs for temperature, because it felt as though it was dragging a brake, but it wasn't that. I wondered whether it was the air filter, but since it's due for a service next week anyway didn't get around to pulling off the tank to look. But after filling it with fuel, it's a happy camper again. Maybe just a slightly dodgy tank of fuel? Can't think of anything else that's changed.