Predictions for Race

Some people think it is bad luck to predict results for an IM. But I am a person who finds comfort in crunching numbers.
Although, there are so many variables that could kick in in such a long day you really never know when you will end up where. So here is what I think I might be doing.

Leg Speed/Time range-- Total time Range(mins)-- ETA finish Time

Swim------ 80-90----------80/90 8:20-8:30
Bike 1st lap- 14 - 16 mph--- 3:30 / 4:18 hours- 11:55-13:00
Bike 2nd lap 14- 16 mph---- 3:30 / 4:18 hours- 15:25-17:00
Run 1st lap- 12-14 min/mile 2:37/3:01 hours-- 18:12-20:00
Run 2nd lap- 12-14 min/mile 2:37/3:01 hours-- 20:49-23:01