It may not always increase mpg per se, but save fuel it does.
I've lived in my area for 20 years and I thought I knew the roads pretty good, come to find out a GPS taught me a few new tricks that I would say saved between 5-15 minutes a day... Like I said it might not increase mpg per se, but it did save me time and hence fuel.
A FE gauge should be standard equipment in every vehicle.
if you had a carputer like fourthbean then you could set it up to update traffic on the gps program every time you come to a stop. just have it automatically log into some wifi and update then drive away.
but that is way more complicated than I can see prolly ::
Until this moment all that I have known
Is death's attempt at imitating life
And for the first time I am truly alive
-Becoming the Archetype
I got my Wife a Garmin for Christmas, so she would stop calling me and saying "which way should I turn?". Seriously. I've got no idea where she is, or which direction she is going, and she wants to know which way to turn.
Anyway, the Garmin supports live traffic reports, and rerouting, too. She'd get a 15 month subscription to the service if I bought her the module. But it costs $160 for the module, then $60 per year after that. Sheesh.
I drive for a living doing claims and in January I got a GPS Garmin Nuvi. Before I would be able to visit 4 maybe 5 clients a day, now with the GPS I can reach 7 to 8 clients a day. The time spent on the side of the road digging through 120 dollars worth of maps has been eliminated. I don't have the numbers, but I can now get 2 days worth of business out of a tank, as before I would have to fill up on the second day. Fuel is being spent on business and not on being lost.
Also as a side benefit, it has internal batteries and can be used for hiking and walking around cities. If your an avid boater, it gives you water ways and speed. It has improved my life. Get one, you'll love it.