yes, I understand your POV, this will be tough to get accurate numbers, but even if I fail to get good accurate data, It will have been a nice try!
Starting from 0 km/h and finishing at 0 km/h. I will try to accelerate from 10 to 30 km/h in 5-7 secs, and then coast until my speed drops to 10 km/h, etc...
Also, updated the bike to help data hehe... :
BOAT TAIL!
I have tested it on 5 miles for now and I can feel a diffence in longer coast.