re big tankage;
For me its a 'cost per mile' thing.With a range in excess of 2000,I can choose my cost to fill.
eg. I fill at the duty free at the international border for a saving of (typically ) $1.00 a gallon.Not everybody has that option, but the longer your range the cheaper the state you can fill up in.
Also the truck pumps run a gallon a second - in and out in a very short time.Sure pit stops are still necessary but at a place you want not a compromise.
With a range that is most cross country I have done trips and not refueled at all.