ive taken mine to about 10 and it was fine, admittedly the station i used was about 500m away, put in a fiver then did about 12miles and filled up on route!
The one in my Focus is pretty accurate, only time it can be wrong is when I have just done a motorway stretch and are in the city as it still thinks that I have motorway fuel usage when in fact I am using more fuel as I am city driving.
If it indicates I have 20 miles to go and I refuel I find out that there was 2 liters left which is about right.
Also I think the computer becomes more accurate the longer you use it.
Mines not too bad, will normally tell me I have less than I think though. It can say 0 miles and I can comfortably get another 20 miles out of it. I know it's not good practice but it was an emergancy (forgot to fill up and it was bank holiday and nothing was open, how annoying)
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