Is the season suitable to drive?

How long would I be on the road each day? Any recommendation is appreciated.
22/9 - Sin - Tok
23/9 - Tok - Hakodate (flight)
24/9 - Hakodate - Lake Toya (drive)
25/9 - Lake Toya - Noribetsu (drive)
26/9 - Noribetsu - Otaru (drive)
27/9 - Otaru - Sapporo - Furano (drive)
28/9 - Furano - Ashaidake (drive)
29/9 - Ashidake - Sounyko (drive)
30/9 - Sounyko - Lake Akan (drive)
1/10 - Lake Akan - Kushiro (return car & flight to Haneda)
2/10 - Tokyo Disneyland (JR line)
3/10 - Tokyo - Mt Fuji
4/10 - Mt Fuji - Tokyo
5/10 - Ginza / Akirharaba
6/10 - Tokyo - Sin

For driving in Hokkaido, you can use the following search site to get some ideas on the driving distance and time

http://northern-road.jp/navi/eng/index.htm

Yes, it is a very nice season for driving in Hokkaido. Some higher elevations start to have autumn colors.