I was told recently that kero in a PSD will work and run better but not to cut it @ more than 20% it raises the cetain points. In the winter we have r fuel cut with kero for gelling protection. As for red (off road) diesel its a bad idea, the dye stays in the system for a LONG time. I used to run it in my 89' 7.3, luckly never got caught. The fine r calculated by the Gallon. Oh and be careful with buying kero, because most of it is dyed these days. Because its tax free, find taxed.