http://www.fourthway.us/mileage.html Vehicle specific modification assistance, from the author. Verification of quadruple MPG: http://www.peswiki.com/index.php/Article:Truth_About_Acetone_and_Ethanol#Sept._4.2C_08.__400.25_EPA_MPG_Accomplished

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Want better gas mileage? Get a screw driver and spend 2 minutes here
http://www.midlandsconnect.com/ The mass air flow sensor in your car tells the computer how much gas to pump through your engine...the less gas the computer thinks it needs means better mileage, right? Right. Scott Allison shows Tyler Ryan how easy it is to clean out your sensor, keeping you on the road longer and paying a bit less for gas.

Almost Double the mileage with small Mod
Xynergy USA claims to almost double the mileage on the Yaris

Pat Barber shows us a 120mpg 4x4

Acetone/Xylene for better MPG tested
An unscientific test showing that the use of 3 ounces of acetone plus 3 ounces of xylene in 12.5 gallons of gasoline does nothing to improve fuel mileage.