Hi I bought a 2015 a6 this month with 20k on the clock. I was led to believe that the MPG should hit 60mpg if driven correctly. I have done two long motorway journeys. Fluctuating between 60mph and 80mph. The best MPG I got was about 52mpg. Driving around town at a steady 30mph pace in efficiency mode the best I have got is 45mpg. I have turned off all the internal heating and cooling. I have nothing unnecessary being on that I know of. All the tyres are inflated adequately. Has anyone got any advice as to why it might be low. or if this is actually the norm?