Hi Dave, I've never found fuel availability to be a problem in Canada. That said, I've got extended range tanks. I prefer going north through BC but this trip swung out into Alberta both directions because of the forest fire smoke in BC. Going through BC and the Trench gets you to Watson Lake, Yukon where there is a credit card pump. This trip I picked up the Alaska Highway at Fort St. John and followed it through Alberta and BC and then on through Yukon too.
I posted this picture in the cargo pod thread:
IMG_3751.jpg
The fuel bags available from Alaska Bushwheels are a great product. With these four bags full and the extended range tanks you can haul around 65 gallons. At 6 gph that is a lot of miles.
In the Bristol Bay area we bought fuel at Iliamna and Dillingham.