Yes, can be corrected in TuneECU. And setting, well too many variables for anyone to tell you the setting. You need to work it by trial and error. You can make a pretty good approximation. Time yourself on known benchmarks -- around here, some roads have tenth markers which can be helpful. Best is a GPS-sensing speedo (Android phone apps work well for this) and run a constant speed on flat ground is best, and elevated speed (speed limit out west is fine). Take the indicated speed, and subtract the actual speed to find the difference. Divide the difference by the actual speed (GPS-driven), and this will give you the percentage that you're over. Make that adjustment via TuneECU, and rinse and repeat until you've reached your good enough. It really doesn't matter what is the factory setting - you're going to adjust to what is correct for your tires on your bike.