When I first got my 2017 Niro EX I was getting 69 miles per gallon driving it on short trips. Now that I'm doing a 80 mile a day commute I'm averaging 55-59.
See the attached picture showing the in-car "fuel economy reset" setting. I assume that if this setting has been at "OFF" since the time you first bought your car, then the displayed mpg would be your (car-calculated) lifetime fuel economy so far. But when I bought my car, it was set to "after refueling" (which I prefer), so the mpg that is displayed is always per tank. (Of course, you can always manually reset it anytime by long-pressing the OK button.) But I don't really trust the accuracy of what's shown in the dash. For example, right before my last fill up, the car's computer showed 60.3mpg for that tank. But after filling up, the phone app that I use showed a true calculated fuel efficiency of 55.2mpg for that same tank of gas.Actually, how does one get the lifetime mileage? What is the menu direction to get to that number?