There are many opportunities to boondock once you get onto the Alaskan Hwy. We like to keep our tank full so we can keep all our options open. We only fueled up once in Canada on the way up (Dawson Creek, BC) and once on the way back(Vanderhoof, BC). The fuel was always cheaper in the US, even Skagway. I don't remember Hyder, AK. It's so isolated and so small, I'd be surprised if it would be much cheaper.