Mpg gauge needs to be reset. If you have not done so from a long time - it would have settled to the avg. value. Lets say after 4 years your avg is 53.7 - its not going to change much in 1 or 2 months then.
But this number is stunning - its equivalent to 43 mpg USA - there are states where diesel is much more expensive than gas but in states where this is not true - that beats even Kia Niro numbers for top trim. Wow.
Imagine that 300 lb ft of torque so much cargo yet Kia Niro's efficiency. Blown away.