From the Open Source Guru- Open Source Gas!

I'm not going to write much about this, just going to show you a few websites that may inform you on some methods to increase your mpg for your car without any modifications and to save gas!

http://www.hypermiling.com/ - "What is hypermiling? According to a a fantastic August 2006 story in the Washington Post, it is a method of increasing your car's gas mileage by making skillful changes in the way you drive, allowing you to save gas and thereby have an easier time withstanding the rising oil and gas prices."

http://www.abovetopsecret.com/forum/thread199143/pg1 - just a topic I've made that has collected tons of information on how to increase your car's MPG

http://www.ehow.com/how_2629_increase-gas-mileage.html - "You may have noticed how expensive gasoline is these days. A few simple steps can improve your gas mileage, and free up more cash for the more important things in life - like ice cream. Follow these few steps to increase your gas mileage and ease your wallet."

http://www.pureenergysystems.com/news/2005/03/17/6900069_Acetone/- "Readily-available chemical added to gas tank in small proportion improves the fuel's ability to vaporize completely by reducing the surface tension that inhibits vaporization of some fuel droplets."

http://www.getrichslowly.org/blog/2007/05/30/how-to-improve-your-gas-mileage-23-top-tips-for-better-fuel-economy/
- "Fuel prices have been hovering at record levels around the United States for the past few weeks. Now is a good time to review of the best ways to improve your gas mileage and save money at the tank. I scoured dozens of web sites and read hundreds of tips — these are the best of the bunch...."

Here are some Websites I've found that has helped me find the cheapest gas around me.

http://www.gasbuddy.com/
- GasBuddy.com can help you find cheap gas prices in your city. It is a network of more than 181+ gas price information websites that help you find low gasoline prices. All web sites are operated by GasBuddy and has the most comprehensive listings of gas prices anywhere.

http://autos.msn.com/everyday/gasstations.aspx?zip&src=Netx
- Every night MSN Autos receives pricing data from over 90,000 gas stations across the nation.

http://gasprices.mapquest.com/
- Find your Local Gas Prices using mapquest

Hope this helps!
James Andreasen (His Blog)