I really enjoyed the short tour of Hokkaido and I will definitely come back for another tour at some point. Hokkaido is a great island for cycle touring if you are looking for a more relaxing and easy going type of your. What I loved about the place ? Mostly the greenery and natural surroundings. Camping is so cheap and convenient and tons of information about the island are available either online or at information centres. As a traveller you are spoilt for choices for accommodation. Camping free or paid are all over the place and so are rider houses ( organised mostly for motor bikers touring) can be for free or paid. Camping if not free cost from 300 Yen to 600 Yen and both free and paid are always with clean toilets and open cleaning kitchens. Rider houses can cost around 1000 Yen per person. Hostels and hotels are expensive. Be prepared to pay around 4000 Yen and above.
Food and drinks inexpensive if you buy from the supermarkets. For a quick meal you have the options of abundance of convenient store like 711, SeacoMart or Lawson in almost every town. Food package usually starts from 300 to 500 Yen. Premium beer is around 200 To 250 Yen per 500ml can and if you are not choosy the cheapest beer cost around 70 to 80 Yen. Wine is super cheap too. You can actually fine super cheap very drinkable Spanish wine from SeacoMart at around 400 Yen per bottle.
If you are frugal can actually tour for very cheap in Hokkaido. Here is my spending for your information. 
Reflective Saddle 
Lots of useful information, thank you!