Since I don't travel very far too often, I usually don't worry about cheaper fuel prices too much. The prices don't vary that much in my "local" area. Even though I do use the Bronco tank in my truck, I still try to fill up after I pump fuel to the front tank. It's just a mental thing that makes me feel better spending less money. I just put $74.46 in mine for 21.16 gallons at $3.51/gal.
Yeah it's WAY easier for me to put $30-40 in every week than it would be to put $60-80 every two weeks. It's the same amount of money, but it hurts less