On a trip where you will use more than 1/4 of the tank without stops, don't waste fuel by not carrying enough fuel.
Depending on where you buy fuel, might save by filling tank up for a bit cheaper than what you will save by not hauling fuel around.
I believe the fuel pump uses recycled fuel, fuel pumped but not used by the engine, to cool itself so running low all the time can make the fuel pump run hotter and have a shorter life. Course the mechanic replacing the pump will be glad the tank is not full so maybe this equals out somehow.
I do not want to stop at gas stations more often, I can go 1.5 weeks on a tank of fuel and keep trying to get it to 2 weeks so I can fill up at my favorite station while getting groceries and stuff. I tend to just top off each week right now.
I am debating removing the 2 middle seats, they are always folded down and I think I want the storage but may just wind up hauling more junk. What is in vehicle matters as much or more than the fuel we are talking about. Junk I never use vs. fuel I know I will use is what I am thinking here.
I remember when reading about minivan tow ratings the 3600lb rating for towing was only if the seats did not tumble. The seats that tumble weigh more I guess and eat up 100lbs of that tow rating.
My van does not have the tow package and I have not bothered to have it weighed. But I would basically go get the van weighed and add that into considerations with the numbers mentioned already.
I bought a leftover 17 pacifica but considered trying to find a tow package on the lot somewhere or special ordering but decided it was not worth it to me right now.
2017 touring nothing special version