What mpgs are people getting now in there gtd's? My gtd has 29k on the clock and for the past two weeks I have decided to drive like a grandad just to see what mpgs I can achieve. The car is saying 61.8mpg since refuel and if I ran the full tank it says I should get 660 miles. I will fuel up tomorrow and calculate doing a brim to brim calculation. I reckon it will be 60mpg.