Robert Archey

FuelFrog is a great tool that will help you track your gas mileage. All you need to input are how many miles you drove since your last fill up, the price per gallon you are currently paying for gas, and how many gallons of gas you are filling your tank with. Each time you update, you will get basic statistics of your cars fuel efficiency. This should help you gain some insight on how aggressive you have been with driving in comparison to previous refuels.

You can also combine this tool with Twitter to allow you to update your account via text message. Very convenient to do while waiting for that tank to fill up.

FuelFrog.com (via Lifehacker.com)

What is hypermiling?

Hypermiling is the act of adjusting your driving techniques to maximize fuel economy. Energy lost in fuel is a result of several various automotive behaviors including engine efficiency, aerodynamic drag, rolling friction, and kinetic energy lost to braking. There are some nice mileage gains when using these hypermiling techniques, it will take some patience to become an expert, but definately worth it.

To find out more about hypermiling, check out these useful links:

Wikipedia.org
CleanMPG.com