MPG is certainly the standard for comparing fuel efficiency and I can quote the MPG for any of my vehicles, but if asked I couldn't tell you the fuel capacity of them in gallons, but I can in litres.
So if I see I have quarter of a tank of fuel, I know how many litres that is and knowing the litres per mile I know how far I can go. The Km stats not much use because we work in miles.
Of course I can work it out like any stat but it would be nice to see the average on my customs stats if it were available.
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