Running Diary 0036: Ultimate aerobic speed

6 Jan 2014, 23C, rainy.
12.4km in 1:38, Avg HR below 120bpm(20 beat lower than MAF). No heart rate drifting, means the pace could be msintained longer...than MAF pace. If I properly hydrated and nutrated, I should no problem finishing 100km in ~13hrs. And I should only digest 110Cal per hour to get sufficient energy, far below 300Cal per hour body limit (the fat/sugar burning ratio is 60/40 under 120bpm for me). The loading for my digetion system is low and I should suffer gastric disorder no more. This is the true aerobic speed I'm seeking. I should stick on this pace, accumulate as much mileage, and try out the most confortable fuel pattern for the coming Twilight Ultra Challenge.