approx 5000 km: 16L/100 = 800L

July 14 Sat: Calgary -> Slave lake (5.5h) 550km
July 15 Sun: Slave Lake -> High Level (5h) 500km
July 16 Mon: High Level -> Fort Resolution (6h) 460km
July 17 Tue: 
July 18 Wed: Fort Resolution -> Kakisa (4.5 h) 300km
July 19 Thu: *Kakisa -> fort simpson (5h) 322km
July 20 Fri: *fort simpson -> Kakisa (5h) 322km
July 21 Sat: Kakisa -> Yellowknife (5h) 380km
July 22 Sun: *Yellowknife -> cameron falls (1h) 50km see also tibbit lake
July 23 Mon: cameron falls -> Fort Providence (4.5h) 360km
July 24 Tue: 
July 25 Wed: Fort Providence -> high level (4.5h) 415km
July 26 Thu: high level -> athabasca (6h) 616km
July 27 Fri: athabasca -> calgary (4.5h) 450km
July 28 Sat/Sunday we need 2 days if there is a problem

removed:
(near high level) *Hay-Zama Lakes Wildland Provincial Park (3h round trip) 140km each way west on 58 (or more if we goto rainbow lake)