Buying gas like an investment

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My brother does this interesting thing when he buys gas, similar to "dollar cost averaging" in investing (i.e., investing the same amount each month, regardless of whether the price is high or low).

Basically he pays the same amount at the pump on each visit ($20), regardless of whether gas prices are high or low.

I was trying to think if this has any real benefit, and actually I think it does. When gas prices are low, $20 will last a long time, which is good. When gas prices are high, $20 will last a short time, and you will be forced to retry again soon - so you will have more frequent opportunities to try again for a lower price. Kind of makes sense.

Compare this to filling the tank to the top every time. You will be visiting the gas station at a constant time interval, without the automatic adaptation mechanism described above.

Interesting!