We drove my wifes QX60 on a 1000 mile trip recently. I wanted to see what mpg we would get so i reset it by using the center console buttons. When i did this, i noticed the one you can see above the steering wheel (when you scroll to it) never changed. I noticed over the course of the trip that it changed but it would never reset like the other one. Is that one intended to measure mpg forever and the other one the on,y one that can be reset? Seems strange...