Avg 15-20mph maybe sometimes 20-30 if Im in the real aggressive mode and Im on a familiar road. Unfamiliar rds deserve some respect. Ive never heard of a avg, I would say each rider has their comfort zone. If youre thinkin about stepn up your entry speeds ease into it brother,
Small steps, turn it up my 5mph at a time and ride that until you feel real natural at the higher speed then kick it up another 5mph and so on.
As for your riding position change by crouchin fwd a little that makes ur air signature smaller so less turbulence and your center of gravity gets lowered a little, both help the line the bike can follow thru curve.