In these newfangled cars (I jumped from an 09 to a 17) the dashboard tells you your standard trip meter (which I reset every fill-up) and how many miles you have on the tank
So I drive to maximize the sum of the two, trying to go the most miles I can between fillups and thusly improve my mileage, usually by using the cruise control in more places to maintain a smooth speed curve
MrsW still drives like a BOOH and yet gripes that I don’t retain sufficient control of the car coz am gonna crash into the car in front of us, even tho my brake foot still hovers over the brake which is more than it can do when it is on the accelerator
But I get at least 15% better mileage than her (it was 8-10% before I got this kind of car enniways)