Wow, thanks for the education, on Cetane. I didn't know if it was a really big deal or not..Now I know a bit more about it.
Could this be why, my Freightliner, runs better, even with a higher water content in the fuel when it's warm/hot, than it does, when I first start it up. It burns off the water, a lot easier, when the engine is burning the fuel a lot better, too? It just steams the water, instead of it hanging around..?