A study published by the American Chemical Society has shown the power of coffee grounds as a source of biodiesel, possibly ending America's dependence on the unfortunately named rapeseed.
According to a study in the ACS's Journal of Agriculture, spent coffee grounds contain between 11% and 20% oil by weight, similar to other popular sources of biodiesel such as soy and palm seeds. Since approximately 16 billion pounds of coffee is grown each year, spent coffee grounds can be used to create as much as 340 million gallons of biodiesel. While this is barely enough fuel to cover the US for a day, it is a surprisingly cheap and easy process they say could net an $8 million average profit in the US alone. We could probably fuel a TDI SportWagen by just following Wert around for the day. Press release below.