my wifes been using the car this week take kids to school,i know she drive steady,last week i did 110 miles and it used £26.66pence of diesel........this week its used similar,why is this,ive filled it up at sainsburys both times and car runs brilliant,ive always filled up to the neck so i cant get more in.....theres no vent button on it that i can see (my a4 had this) is it self venting differently and making me think its used more.....from full ,when the gauge moves a quarter i know im expectin £23+ to fill again....But why is it using so much? even on vag-com the coolant sensor reading are getting over 83/85 so i rule out the coolant sensor being faulty. Distance covered:- miles Litres of fuel used :- 18.50 litres @131.9 pence per litre =0.24mpg ! Distance covered:- miles 99.1 ! Litres of fuel used :-1850 litres @ cost per litre 131.9 (pence) Your fuel consumption ( MPG) ( Km per litre)( litre per 100Km) Averaging pence per mile (40+ mpg for petrol is good under 23 is bad) So * miles would cost *Change this figure to recalculate the example.