Huge drop in MPG MINI Cooper D

[stabbed rat]

Anybody got any ideas why my car might be suffering from a sharp drop in MPG?

It is a 2008 MINI cooper D auto that usually gets me about 40-45 mpg. At the last service (about 8000 miles ago) it had a diesel injector loose which they apparently sorted out. Even this didn't cause an MPG drop like what I have now. It is now struggling to return much more than 35MPG. I haven't changed anything on the car or my driving style as far as i'm aware.

Even when cruising on the Motorway at an indicated 75 (actual of about 69/70) it is returning around 40mpg (taken from the on board thing)

I have checked the brim to brim maths against the mileage per tank and it always seems to add up as near as makes no difference correct.

[DanGT]

Take it back and ask them to have a look. It would suggest somthing is not right but this could be so many things. It may just be they did not put somthing back or knocked somthing wehn doing the other work?

[stabbed rat]

Going to phone them today, been aiming to do it all weekend but only just getting round to it.