What I meant was, if you use 5 gallons every week, you still have to buy 20 gallons a month, whether you buy it every 5 gallons or 10 gallons or every 20 gallons. You're still spending the same. Only the frequency changes.

My husband has to fill his tank three times a week, and DAMN that's adding up each month. Last night he filled up at Costco and it was $3.09. It was $2.95 just last week. He swears that the Costco gas gets him better mileage, though.