[Christ]

Also, if you're going to use alternative fuels permanently, adjust the pump timing to compensate for the change in viscosity. This also changes internal pressure and "break point" for the injectors. Heavy fuels will inject too late, light fuels will inject too early.

You can also (believe it or not) run your diesel on raw gasoline. It will not start, but because of the IDI type of engine, it will run on basically anything, although it will need to run at a higher RPM than stock idle to keep running. I've done this in a couple engines because not all fuel stations have diesel pumps. I don't recommend it, but it's cheaper than dumping a couple gallon of new veggie oil in the tank. Don't use much, and add fuel as soon as possible. Don't shut the engine off, it won't restart because the fuel is too light and the injection event won't be timed correctly.

Another cheap alternative is used oils. Most service stations will have some used oil in a jug somewhere that they'll give you. At least filter it through an old T-shirt or something if you can, but your fuel filter will catch most of the debris, if any.