Does a GPS navigation system save you gas?
The problem is, because the Navteq paid for the study, you have to be a little cautious about their objectivity. Personally, I believe it. Having used a GPS satnav to travel long distances, I find that I can get from point A to point B much more efficiently than with a printed map or directions. Of course, on a daily basis the only real benefit would be if your GPS had traffic avoidance. But If you can avoid sitting and idling for long periods of time, you could save some fuel there as well.
[via Navigadget]