As soon as light comes on you've got 50 miles left based on an average of 33mpg.
The light comes on when there's 8 litres left so just short of two gallons.
To be safe, if you're driving around town I wouldn't go over 30 miles.
One tip would be to put a gallon in your boot in a can, then re-set your trip the instant your light comes on.
Then run the car out of petrol and see just how low you can go!!!
I read on the Focus forum once that one guy had done this in his focus and got 80miles!!! before he ran out!!
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2011 Focus 3-door Zetec 1.6 TDCi.
Previous <img src="/images/graemlins/stemo.gif" alt="" />s - 2006 Panther Black & 2007 Red. Gone and quite forgotten <img src="/images/graemlins/lol.gif" alt="" />