Simply put, hypermiling is "hacking" your vehicle's EPA listed fuel economy rating. For example, my 2002 Saturn SL1 has a listing of 23 (city), 34 (highway), and 27 (combined). According to MyMileMarker, my combined average is 34.6!
So, how do I do it? Drive slower (55mph, no more!). Coast to stops (or even better, time your traffic lights), and accelerate slowly. I'm including my delicious page of hypermiling links, because it's how I learned. The thing that sticks with me most is this quote,
I'm still learning too. I'm certainly not an expert like Wayne Gerdes, or those "Prius guys", so I still have much to learn. I've been experimenting with Potential Parking and Ridge Riding to see if it helps."When you're stopped, your car gets 0 miles per gallon."
The biggest thing I worry about is safety, though. It's not worth my life, nor anyone else's, just to safe a couple bucks in fuel. That means, NO DRAFTING (usually, lol), and you actually have to be more aware of your surroundings and traffic flow. I recently applied for a Hypermiler decal from the Hypermiling Safety Foundation, which was formed specifically to make people more aware of hypermiling, and make hypermilers safer in their pursuits of greener travel.
While my goal would be to never have to drive, when I'm forced to, I'd rather do it as efficiently, cheaply, and the least dependant on oil as I possibly can. Wouldn't you?