What's wrong with coasting?
100+ Hypermiling / ecodriving tips & tactics for better mpg - EcoModder.com
65+ Vehicle modifications for better fuel economy - EcoModder.com
Start with the driving tips, as working on your own driving skill is the easiest way to get better MPG, and follow with looking into aerodynamic mods. Don't forget to inflate the tires up.
I recognize your name from NissanClub, and I saw your thread over there about aerodynamics. Haha, a lot of those guys in that thread have the same misconceptions I had before coming here. The people here know a lot more about aerodynamics and what saves gas than I thought, and I've seen a lot of old school thought dispelled here.