It's nice getting change from a ten when filling a five gallon can. (Or more often, putting the few remaining cups in the car's tank.) It's even nicer that $20 will pretty much fill my tank unless I had to push the car to the pump, and that that's enough for over 400 miles of open road driving. Even with my long weekend drives to north Dallas, I rarely do over 250-300 in a weekend, and that would assume either two activities in very different places, or a not-very-convenient place to sleep on someone's couch...and nobody to carpool with from Granbury or Weatherford.