Originally Posted by 631twentyeighteye
With my old diesel i noticed a huge difference since they would put anti gelling chemicals in. usually about 5mpg(down from 25-20). With my bimmer, i notice zero different. 23-25mpg 80% highway always using the same mobil 93 octane.
My wife drives a 2005 vw golf diesel (guess what car is sitting on the driveway
) - zero difference