In September 2016 I bought a Porsche Macan S diesel. The claimed mpg by Porsche is 46.3. Obviously I did not expect to get anything like this but my normal experience with other cars, the last an Audi TT, is that I easily get the real world mpg figures that the motoring press claim. I am a swift driver but have high regard for my tyres and like to read the road ahead, thereby reducing the use of the brakes and fuel. Since owning the car it has done a couple of thousand miles. I measure its fuel consumption by recording the mileage and litres to refuel on a spreadsheet. However I use it, it returns 32mpg. That includes the German autobahn where I have to admit to being up to 128mph at one stage but also gently driving with the express wish to get what the motoring press appear to feel is a realistic figure of around 39. It is, for this second thousand miles, on Porsche supplied snow tyres although there is no snow. Could there be a reason, other than my driving, why the fuel consumption is so much lower than that normally achieved?