Calm before the storm

The Olympic cross country ski stadium (and finish of the Birken) is mostly empty. By this afternoon, the 1000+ skiers touring the Birken (untimed) will arrive, and tomorrow the 10,000+ skiers racing the Birken and Half Birken will arrive at the finish line. I hope to be one of them!

An easy shakeout this morning for 45 minutes to look at some more hills. I have skied the sections (in red) on the course. I have handled the downhills reasonably well; however I had obviously not skied the 35k preceding them, and they were in primo conditions, but how will they be after thousands ski them before me? Finally, how much gas will be in the tank, and how congested will those downhills be?