MRV,
The normal data plots (Add Data) are for tanks. It clearly states this on the page. The "best" and "worst" mileages are simply attributes you can stick to that car and update manually if you so choose. Note that they're only optional. Many like to use it for their best tank (like myself), and others record 30 of their best miles or so. None of it is listed for statistical purposes, and is simply displayed on your detailed page without any calcuations.
Also, what do you mean you could not input tenths? There are two text boxes. The first is for integers and the second allows a tenths place.
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