hi i have a 2.0 dti estate 04 and im only getting about 400 miles out of a tank driving about half town half motorway which is really bad. the reason i brought the car was for the good mpg...... also my drive to work is 16 mile and the tempreture dont budge. get hot air but needle dont move need to do about 30 mile for it to start moving.... 2 months ago done service myself change oil, oil filter, diesel filter, air filter. any one have any ideas why i have such a poor mpg???????. thanks for looking in.