One thing to note is that, unless you are a time trial specialist, average speed is not a particularly useful metric. Because I had been racing triathlons, I was able to bomb along at 20-21 all day, but when the group ramped up to 27-28, I would get dropped. Mass start racing means being able to accelerate, go into the red, recover, and do it again. Multiple times. And that's why every racer I know does interval training. I'm sure they'll cover this at the performance program.