Has anyone else noticed this same thing? Have a 2008 Outback 2.5 and I have recently noticed that my gas mileage has not been the same. Over the last month and a half I seem to only be getting an average of 135 mpg from a full tank to half a tank. I've been using the trip/fuel/outside temp gage as a reference which now will read anywhere from 22.4 mpg to 19.8 mpg. A great majority of my driving is freeway driving, prior to this it would normally read 26.8 to 27.4 mpg. Could this big difference be due to we are now using Winter Grade fuel or is the above gage not a true source to use? When I was or thought I was getting better mileage, I could go approximately 300 miles from a full tank to a half tank, not anymore I have even taken the car to the dealer for their thoughts and they say it is normal mpg's and even had them do a 90,000 maintenance service on it.