Ok so we had to replace the fuel pump on our 2012 VW Passat. Tbh the mechanic ****ed up the car and we were back and forth for a week to him. Anyway it was replaced properly last Thursday and we put €50 diesel in to the car, the diesel is now in reserve and we’ve only done 301 miles. When I checked a few months back we were getting an average of 52mpg, this week only 30mpg.
Does anyone have any ideas/suggestions as to what could be wrong? Could it be something else that the mechanic did?