Ever wonder just how much it costs you to drive from point A to point B? Here's a website that will tell you precisely how much you are spending on gas every time you pick up the keys. It also tells you how big of a carbon footprint you are leaving with every trip.
mpg
The real cost of driving your car
How to save on gas
Here is what a family that drives 12,500 miles per year in a vehicle with a fuel economy of 20.1 miles per gallon could save in specific areas:

3 Easy Tips to Increase Your Car's Fuel Efficiency
I now use 20% less gas than I used to. This saves me money, plus helps the environment. If everyone followed these tips, imagine the environmental benefits we'd have (plus the money we'd save)!
The Easiest Ways to Cut Gasoline Consumption
Some simple tips worth repeating. Maybe if we hear them enough more of us will actually implement them.

Fascinating Video of Hypercars (Super Efficient Cars)
Amory Lovins describes how hypercars will be lighter, stronger, more gas efficient, and safer, and how he expects these super-efficient cars to be on the market within 5 years. Very interesting video.
Gas Above $3.50; Will Almost Certainly Hit $4
In looking at data from the last several summers, the price of gasoline has gone up, on average, over 15% from now through the summer's peak. Based on today's price of $3.53, this would put us above $4 gas this summer.
With six DIY efficiency mods, Car & Driver improves a car's MPG by 25%
In response to the '73/'74 oil crisis, Car and Driver magazine tweaked a bone stock production car to make it more efficient. The results? 25% more highway MPG from their "Crisis Fighter Ford Pinto," using six relatively easy DIY modifications.

Learning How to Drive Green
Meet Wayne Gerdes:
Wayne is the most fuel-efficient driver in the world. Seriously. There's a competition and a trophy and everything.
Wayne drives a 2004 Honda Accord which, according to the US Department of Energy, gets 23 MPG city.
Read the rest at: http://www.bravenewleaf.com/environment/2008/01/learning-how-to.html

Hybrid Hacks can increase MPG now. Electric hybrids still years away.
Driving techniques help, but a few basic modifications to your hybrid could increase MPG by 50% or more...

Jeep Renegade Concept Transforms Auto Show
The Jeep Renegade Concept with its 110 mpg rating has been unveiled at the Detroit Auto Show and is set to transform the industry.

Aerocivic @ Ecomodder - how to drop your Cd from 0.34 to 0.17
An extreme ecomodder gets great mileage by modifying his car's aerodynamics.

How Many Miles to the Gallon does your car really get?....
You might know how many miles per gallon your car SAYS it gets. But do you know how many miles per gallon it REALLY gets? Here's how to find out...
Top 10 Ways to Reduce Gasoline Consumption and Increase MPG
Increased gasoline prices are going to affect you in some way. While the price increase may hurt some more than others, we’re all going to have to become accustomed to the fact that the days of cheap gas (and energy in general) are in the rear view mirror.

Biodiesel turbine, super capacitor, series hybrid... HUMMER! (60 MPG and 0-60 in 5 seconds)
"They could do all this stuff if they wanted to. ... The technology has been there forever. They make 90% of the components I use... I've just been messing around and seeing what I can do. ... Everybody should be driving a plug-in vehicle right now. ... I can go next door to Ace Hardware and buy a DC electric motor, go out to my four-wheel-drive truck, remove the transmission and engine, bolt the electric motor onto the back of the transfer case, put a series of lead-acid batteries up to 240 volts in the back of the bed, and we're good to go.
Climate Change Bill Proposes 50 Cent Per Gallon Tax
It has long been theorized that the only way to really get Americans to drive less or purchase more fuel efficient vehicles would be to hit them in their wallets. This bill would do exactly that.