Free Ford Tempo Diesel and GMC Diesel Pick up

[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.

[vacationtime247]

Still driving this daily. Seems no matter what I try, 50-52 mpg is where I'm at. Last fuel log, 374 miles driven, 7.153 gallons of diesel, = 52.29 MPG Not bad I guess. Just feel like 55 to 60 mpg can be achieved.
VT247

[renault_megane_dci]

I had a IDI diesel for a while and the fuel consumption was very stable either trying to up the MPG or trashing it.

I feel you can't really improve on it unless doing a transmission swap or at least fit tire with higher side wall togheter with aero mods ...