We made the drive to Alaska this last summer with our 2007 Big Horn 3055RL and 2007 Chevrolet 2500HD diesel which gets about 11.5 when towing. As I understand it Canadian law requires that every gas station is required to have diesel as well as gas. We found that to be true. I carried extra diesel, but never needed it. We never had any problem finding a station that had plenty of room. The Milepost was always very accurate in telling us where we could find fuel. However, when we got down to half a tank or had traveled about 200 miles we filled up at the very next station we came to. A friend had driven the same route the previous year and had run out of diesel once. He readily admitted there was no reason to have done so.