In this post, I mentioned that Audi and Nissan are working on navigation systems that will give fuel effecient routes. Garmin is also doing the same thing for their portable navigation units. They are adding an ecoRoute routing type. Navigation units with ecoRoute will have a setting that lets you specify the type of car you have. Then it can provide you with an effecient route.
The best thing about this is that they are making this available for all compatible devices. I need to download the web updater to see if this will be available for our Nuvi 680.
[via CNET's CES blog]