What kind of mileage are you getting? Do you really know? Fuelly is here to help you track your actual mileage while giving you the ability to compare it against others driving the exact same make and model as you do. If you find that others are getting better gas mileage, there’s an online discussion board along with tips and tricks to help you maximize the amount of road you cover before your next fill-up.

Fuelly is the brain child of two northwest locals in Oregon (where lots of great sustainable ideas seem to come from these days), Matt Haughey and Paul Bausch. The website came together in a little over two weeks and was initially conceived as a simple MPG history calculator application. It didn’t take the two long to realize that Fuelly would be a lot more fun if it was web base and interactive. Since the launch in July of this year nearly 5,000 cars have been registered to the website. The top cars registered include a smattering of Hondas, Toyotas, and a few Fords as well as a Volkswagen, but one look at their website and you’ll find everything from Ferraris, Hummers, and Aston Martins to Hondas, Toyotas, and GM. Registration is free and their online form takes no more than five minutes to complete.

To make it easier on all of us who can’t help but use our cars to get from place to place, Fuelly can be accessed anywhere you’re willing to call up the website on your mobile phone. By tracking your miles you may find that there are a number of different small things you can do to increase your mileage before you find yourself at the next gas station. Whether or not you register for Fuelly, you can consider these three tips we pulled off their website:

50/50 Rule – As the television show Mythbusters has proven – when traveling under 50 MPH it is more fuel-efficient to leave your windows down and your AC off. When traveling over 50 MPH it is more fuel-efficient to have your AC on and your windows up.

Why charge a red light? – Look ahead, if you see a light is red just coast. You’re not getting through the intersection until the light turns green anyway so why rush?

Cup of Coffee on Dashboard – Pretend you have a cup of hot coffee on the dashboard. Accelerate and decelerate in a manner that would not make the cup of coffee spill.