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However, there are several options available, to suit a drivers particular requirements.
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Well, I miss an option for "todays travels" - reset at every startup simply doesn't cut it imho.
I have set A to reset at fuel-up and B to reset manually (I use that as a "todays travels" meter).
My preference is to keep note of the total consumption by a spreadsheat (hello @aphybrid) *and* at spritmonitor.de as they provide some quite insightful statistics not easyly garnered from a mere spreadsheet (sorry @aphybrid).
Moreover, I have found the reports of the on-board measuring to be off to the lower side compared to my calculations.
The more so, the more "regenrative driving" is involved.