S60, S60CC & V60, V60CC (2011-2018)
2016 V60 T5 here, my mpg has gone down the drain over the past 5K miles roughly. After getting the car back from the last service, (7yr/70K mile service, performed at 72K), I noticed the mileage slowly dwindling starting soon after. I'm struggling to get anywhere over 27-28 MPG on the highway. I...