Originally Posted by
burnthesheep
1. It's not just a physics problem, but a physiology one also.
2. In time trial, if you're not pedalling within 10% of your target power during the event there better be a sharp corner, insufficient gearing, or you've already passed the finish line.
If confused about #2, refer to the part after the "," in #1.
If it's a hilly TT, your target power on the climbs will be higher than it is on the descents or flat. At least if you want to win. It's simple physics/maths. Any pacing algorithm (eg. Best Bike Splits) will always set higher power targets on the climbs (obviously taking account of your personal limits).