Sorry if this has been covered before. I have always used BP Ultimate on all my cars. Recently though, due to the high fuel prices, I opted for Premium for the first time. To my surprise the car, Tiguan 125 TSI, actually used about 0.7L less on average. I filled up with Premium again to make sure this wasn't a fluke and again, the end result was about about 0.7L less.
Has anyone else tried this?