While I have owned the car only a few weeks, it is delivering overall mileage of 50-52 miles per gallon. I did notice that the "MPG" display on the dash is consistently about 1-2 miles per gallon less than that I actually calculate based on mileage and gallons to fill. I am extremely pleasedl.
The Navi system is much more user friendly than my previous 2003 Accord. I seldom touch the screen as voice commands cover most circumstances.