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For brim to brim measurements, these must be carried out using the same pump at the same filling station and filling until the first click is heard before stopping.
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55 on a run is the best realistic figure anyone can hope for
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Quoting from the original post i made at the time...
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Round journey was 412 miles and i used 32.8 litres of diesel.
Now assuming my calculations are correct
32.8/4.55 to convert to gallons = 7.21 ish
412 miles/7.21 = 57.1 mpg
I am assuming that the pumps at the garage are properly calibrated and i used the same pump in the same garage at about the same time of night but i was a little surprised i was getting that sort of economy from a 160k engine and more than a little pleased 
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It seems we are not a million miles apart (pun intended
) in opinion then Brian as my calculation worked out to only 2.1 mpg more than you feel is likely.
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Glutton for punishment --- Previously ... 2.6 SD1 x 2, 3.5 SD1, 820S, 820Si x2, 216 Gsi, 220T saloon, 414, 45 1.4 x2 and now a Cowley 75 CDT