You can just as well make a note of when you fill and how much, and calculate the average the old way. From the post, it seems you do that too, in addition to letting the car do the same thing.
This is what we did back in the 1980's, but things have changed since then.
Today, we have more options.
The trip statistics histogram is better for checking individual trips, if you want to see if you can beat your best effort for a certain journey, or something.
The momentary consumption is better for checking if something suddenly broke, like when the lambdasond broke on my 854 Turbo once. Suddenly the current consumption went from around 8 l/100 km to 20. Obvious that something was wrong.
The resettable average is good for checking a holiday trip or other special occasion, since you can reset it as you like.
If you for some reason want to check a particular range of days, after the fact, you can use the trip log in Volvo on Call and calculate the average of any driving done the last three months.
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