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Dollar cost averaging says the if you invest a set dollar amount at the fixed frequency, you will come out better than purchasing a set number of shares at the same frequency. While filling up the gas tank this morning I was wondering if the same held true. Would I be better off putting a fix dollar amount of gas in the car every week instead of putting a fix number of gallons/liters of gas in the car?

Second part of the question. Now knowing that the number of gallons/liters of gas each week is not fixed. Is it cheaper to top off each week vs going as long as you can before you fill up the tank? Where is the inflection point?

*Note I was unsure about the tags for this, so please reassign accordingly.

3 Answers 3