Does everyones mpg take a while to update? I thought when I first bought the G, the thing would update instantly. But now it takes a mile, or maybe a minute to update. Once I was stopped at a red light and my mpg went up a little. And it usually seems like it is always something point an odd number (ex. 19.5, 19.7) not to often do I see it as an even number. Is this just my NAV? I need to know because I am taking the car in on Friday.

Thanks!

 

It averages from the last time the mpg was reset. Hit the reset option on the mpg display if you want it to change faster. Do that every so often and then you can track you averages on the history display.