I do mostly highway driving,,alot of it a week. I drive 150 miles a day and I have had three fill ups with about 90% highway, 10% city. I am seriously getting about 59.something each fill up. The last fill up I thought i only got 570 miles but then my wife told me that she drove twenty miles around the city and reset my trip meter. I don't use the EV or ECO buttons. How am I getting such good mileage?