There are so many factors that come into play when it comes to fuel economy. Terrain, speed, tire pressure, air temperature, trip length, are just a few that come to mind. If you use your a/c, that will immediatly take almost 10mpg right off the top.

The average in the database is 46 - 40 is not an unresonable nor bad. Why don't you post how and where you are driving.

If you have any concerns (it sounds like you do), have your car checked by Honda service just to be sure and to give you peace of mind!