Done the drive 9 times - it's incredible every time I do the drive. I try going a different way each time too -of course at one point the only road is the Alaska-Canada Highway (AlCan).
Really even an extra 5 gal would be great. I still remember one of the first drives the wife and I did - we pulled into a gas station and they said, sorry we have no gas, it's coming, but it won't be here until next week. I have OCD when it comes to fuel capacity so were we able to drive another roughly 100 miles to get fuel.