I've had my used 2010 Audi A4 2.0 tdi for almost a year now and noted fuel consumption doesn't appear to be that great at all. Just had a 350 mile return from a full tank, if I do mostly long distance motorway I can squeeze 500 miles out of it. This just doesn't seem right? I remember my old T-Reg 1.9tdi Audi A4 Avant pushing 800 miles on a long road trip, perhaps 600 miles if ragged it about town. I'd have thought with a more modern engine things would have been more efficient. The car I have has the CAGA engine code and has had the emissions update by the previous owner, car now covered 150k miles. The engine coolant temperature takes a good 20 minutes driving to get to 70 degrees, but then rarely passes it. The only fault code from a scan appears to be a faulty Glow Plug No 1, but this shouldn't affect fuel and temp surely? Previous issues have included an erratic idle (see youtube video), but a new fuel pressure regulator sorted this. Having said that, there is still a bit of very minor idle vibration at times which goes when I give a bit of throttle. Also steering wheel seems to vibrate at times around the 70 mph mark (wheel alignment and balancing hasn't resolved the issue), no vibration at lower speeds. Car is on original clutch/flywheel as far as I'm aware., although no noticeable slip on clutch yet, but flywheel could be suspect? Seems like a multitude of issues, although engine seems to run fine otherwise. If anyone has any experience in the above issues or could provide any pointers it would be much appreciated.