If you know roughly how many miles per tank you get, and how many tanks you use per month, then you could find out you answer. Example, I average about 700 per tank, one tank per month, so if I select for the last 3 or 4 months, I know how many MPG's I've averaged for the last 2100-2800 miles "ish" ha!
I've always thought a "custom" selection is worth having, so you could see your MPG'S from say November to March in the winter, and compare to the warmer summer months etc.
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