MPG after 15k miles service went down.
 

Hello,


I did my 15k service at the Audi dealership few months ago and I noticed that since then the mpg went from low 30s (I've seen 34 on it before) to 26-27.

Granted the winter got here but I didn't expect anything like that. Is there anything I should check ? What do you think ?

Thank you!
Q