I have an MG HS and since I purchased I have had a issue with the miles in tank reporting incorrectly. e.g. I can do a motorway journey with the car showing 300 miles in the tank travel 195.5 miles and the tank still shows 184 miles in the tank. MG have exchanged the fuel pump system to no avail. The dealership has now advised me as follows "MG has come back to us stating that you can not go off the calculated mileage that the car has made at the start of the journey to the end mileage. You will have driven the car in different driving styles, so the vehicle will recalculate the remaining mileage available in the tank for any journeys carried out. Ie Motorway driving at 60 – 70 mph, your mileage should count upwards due to fuel consumption. As soon as you stop motorways or average speed driving the fuel consumption will drop and the computer will make a re-evaluation of your remaining mileage. I hope this explains more of an understanding as to how the fuel consumption works."

Are they correct or am I being fobbed off?