My 05 1.7 CDTI (100 bhp) is giving me around 45mpg on normal day to day motoring. I tried driving 'carefully' for a while and the car still only returned around 51 mpg. I have also noticed significantly more smoke lately, especially on acceleration, coupled with a ropey start.
What do other drivers of that model get in terms of miles to the gallon? Are the other symptoms above indicative of any kind of problem with my car?