Have you considered straight vegtable oil?

Straight Vegtable Oil as biodiesel Fuel

Diesel engines most suited to SVO fuel include older indirect injection engines manufactured for some farm trucks and passenger vehicles from the early 1970s through to the mid-'90s. Some classic direct injection systems with mechanical fuel pumps will also work on SVO. The key to making straight canola oil work as a fuel in diesel engines is in viscosity. The SVO fuel line has a specially developed in-line heating element, which warms the oil to about 70 C. Biofuels such as straight vegetable oil aren't suitable in all engines, in all circumstances and in all operations. The downside is that straight vegetable oil (SVO) is much more viscous (thicker) than conventional diesel fuel or biodiesel, and it doesn't burn the same in the engine -- many studies have found that it can damage engines.

Myth: The point in mixing vegetable oil with unleaded gas/petrol is to reduce its viscosity so that it will move through the fuel lines and injector pump without heating even during the winter months. This is partly true, another reason for adding gasoline is to thin out the glycerin that is contained in vegtable oil. Gasoline at about a 10% mix will allow the glycerin to burn and flow through the filters and pumps on most engines. Some claim that the even get an increase in power with this form of biodiesel.