How do you hypermile? I've got some of the basics down, such as accelerating slowly, coasting to a stop, etc, and I have a manual transmisison, so I can pop it into neutral and coast, but I'd kinda like to know how I can improve efficiency even more...
There are some sites about it, which I can't recommend since I never got involved with them, but I can tell you you'll learn some cool stuff, be scared of some of the things you'll read, and also hear a lot of ecohippy stuff that you may or may not care for.

The extent of my hypermiling knowledge is basically:
* Keep the revs low - under 2K if possible
* Skip gears if you can, although this can be hard depending on your car and if you are keeping revs low (eg shift 1st, 3rd, 5th)
* Use cruise control
* Don't use cruise control (what?)
- Basically, cruise control is "dumb" and will accelerate on uphill grades and waste inertia on downhills - if you have a steady foot, keeping constant throttle and allowing the car to slow/speed with the terrain (within reason) is the most efficient
* Shut the engine off whenever possible, such as: at lights, in the drive-thru, and any other time your car will be stopped for more than 10-20 seconds
* If you're brave (or stupid, depending on your POV), shut the car off when coasting to a stop - definitely NOT recommended for automatic transmissions
* If you're REALLY brave (or REALLY stupid, depending on your POV), snuggle up behind trucks on the highway to draft them
* If you have thick skin, go at or under the speed limit (but only when people behind you have the option to pass - don't be a d*ck)
* Common sense things: avoid rush hour, take alternate routes that avoid stop signs and lights
* Don't slow down more than you need to for turns... this is also a pet peeve of mine, people who slow down to 5 mph to make a normal turn are annoying