If you're feeling really adventurous, you can make your own bio fuel from used vegetable oil, which is available for free at a lot of restaurants.

      You can either purchase a small production system or
make your own biodiesel to add to your diesel engine by mixing up a few chemicals in a fuel reactor or blender.
 
      You can also fight diesel prices by converted your car into a SVO (straight vegetable oil) engine.  In essence these kits, called In essence these kits, called grease car kits allow you to build a small processor inside your car or truck that will heat and prepare the used vegetable oil so that you can burn it in the cars engine.
 
      A heating element, thermostat and special hoses
that cannot be damaged by vegetable oil are a few of the components of this kind of kit.
 
      Usually these types of converters cost anywhere from $1500.00 to
$3,000.00.  Like most products, you get what you pay for. However
if you install one it is an effective way you can fight rising diesel
prices and make your own fuel for as little as 70 cents per gallon.