My mpg-ometer is currently showing 42.6 mpg after a nice day out with the wife. It goes down a bit when I'm on my own for some reason!
I have noticed a very similar effect.
Not only is your GPS always correct, but incorporates a fuel saver as well. I am the same, I tend to get lost more and use more fuel when I drive the Mog alone. I also seem to have less annoying noise as well
