I was about 400 miles into my second tank. I enjoy watching the NAVI trip computer for instant feedback about my mileage. I reset my 'Trip A' and my NAVI trip on each fill-up.

Many have noticed the difference between the NAVI mileage and the 'Trip A' mileage (or 'Trip B' mileage, depending.. ). My NAVI had been about 1mpg higher than my 'Trip A' (nothing new here).

One night when I shut my HAH off the NAVI showed 36.5mpg (and 'Trip A' showed 35.5mpg) - the next morning when I started the car, the NAVI showed 31.5mpg ('Trip A' still showed 35.5mpg). Has anyone else seen a drop like this overnight (or any other time for that matter)?

I've kept a spreadsheet with my mileage and MUCH more information about each tankful for my last two cars, and this is no different. I guess I'm an info junkie..

Oh... I DO LOVE THIS CAR!!!