On my regular weekly round, when I get down to ¼ full on the gauge, I fill up to the brim at the Shell on the way home at the end of that day. Actually to the nearest full litre that I think I can get in, it's easier to remember for the real MPG figure calculation when I get home, plus I get the maximum loyalty points for my money over time
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Current: 2012 C70 D3 SE Lux Solstice Geartronic, Caspian Blue.
Also: 2002 Audi A2 TDI SE, Crystal Blue
Previous: 2008 C70 D5 SE manual, Flint Grey.