BTW, don't stress too much about your training avgs vs racing avgs. First, the race course might not be at all similar to your training trails, so it's hard to compare. But, if it's any consolation, I average about 8mph on my mtn bike training rides and average 12-13mph at most of my races. Different terrain, yes. But, during races you'll be motivated to a new level and will be able to ride harder and faster than you ever did during training.