This has prob been asked b4 but i cant find the answer.
I have a DCi 1.9 130.
Had it a year.
55 plate with 46k
Managed to get 54 mpg out of it when we first got it.
45 mpg now.............

Just had it serviced but no improvement.
Is there something that would cause this ?
Prob a real dumb-ass question but im new to diesels so not too sure.
Cheers.
Alex