Granted, in today's market the term "low-cost fuel" is a stretch, but the fact remains that some fuel outlets are less expensive than others. For those that don't know about it, here's a link that can be helpful in reducing your fuel costs. We (wife and me, team drivers) use it often when planning our longer trips. It's saved us a fair amount of money over the weeks and months. Perhaps it can save you some too.
http://www.dieselboss.com/fuel.htm
http://www.dieselboss.com/fuel.htm