wouldn't you rather spend 3.79 for 120 gallons in the morning, stop every 3-4 hours to stretch or nap or beat your meat or eat WaHo as you desire, than pay 3.79 in the morning for 30 gallons, then $4 for 30 gallons and be stuck with McD's because that's what's there, then $4.40 for another 20 gallons because you filled up when you had to stop to offload the 3 big gulp sweet teas anyway, and get home with an empty tank again?
I guess if you've never driven something with a 700+ mile range you may not have the concept down of how it works. I do from billy big riggin with my dad, and from long haulin' in the Jetta. of course the big truck experience was a bit different, since dad's prostate has to be about the size of a bowling ball and any 8 month pregnant woman would have twice the range he does after his morning coffee
but still it's nice to stop because you want to, where you want to - not because you can go no further and NEED to wherever you may land.