Just took my M5 to BMW Gallery yesterday for a routine 20k service . (Fluids and air filter). Dropped it off at 7:30am. I get a call at 2:30 saying the spark plugs are a lot of work on this car and they require to keep the car overnight. I said I would prefer to bring it back rather then leave it there. So I go to pick up my car at 5:00. They bring out the car where a tech revved the engine just before turning it off to obviously hear my Eissenman exhaust, no biggie. I sit down, and immediately I notice the car has 8 km's put on it. I went inside and asked if my car was just in for a basic service (that technically wasn't even complete) why was it driven for 8 kms. They said they need to drive it 8 kms to reset the service indicator (srsly?????). I go back to my car and then notice my average gas consumption was 21.8L/100kms. I normally average 14.9, so whomever drove it, definitely drove it hard. In fact my 10 km drive home I managed to get the average consumption down to just 16.5L/100kms, which likely indicates they drove it hard for the entire 8 kms. Oh, one last thing , the radio was on tuned into Virgin Radio which I've never in my life listened to. Please tell me I'm just overreacting, becuaee right now I am super pissed. I left a message for the service manager to call me.
Update: Skip to page 5 and 6. BMW resolved the concerns and gave reasonable explanation as to why there was high fuel consumption and mileage not the car.