in the nav screen.. between the speedo and tach.. it gives several different readings. one of them hasa cicrle with a line thru it and a number value of 9.8. then when i scroll thru the options further there is another circle with a line thru it... and a value of 4. what do those numbers mean? my manual says nothing... and i have no idea what to search for. thanks guys.

 

That navi is worthless..

 

it works fine.. but the question was more about the mpg display.