You can run kerosene in your 7.3. I use to do it periodically in my old 7.3. Ran a bit smoother and I ws told that it helped clean up the injectors and combution chambers a bit. Not sure if thats true. Didn't really notice a performance difference, but I wasn't really paying attention either. You can run farm fuel, but I wouldn't do it. Have heard that it's not filtered and cleaned to the same standard as good old #2 diesel, plus the dye will leave a trace of red in your fuel system that would need to be flushed out prior to going to the dealership. The flushing I am told takes at least several tanks of the normal #2, and you also have to change your fuel filters (it dyes them also). You can run it though. Hope this helps.