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All of these great "go ahead" quotes from people who don't own the vehicle. Let's say just for S&G that you add the kerosene, but you DON'T add it at the "right" mixture and something happens to your engine, injectors, etc. Are all of these "experts" on this board going to pay for your repairs that aren't covered under warranty. Insead of "burning" 2 dollars worth of kerosene in your Ford, why not sell it to these "experts" in their rigs so if something happens it's on them? All this nonsense to "save" a few bucks....really!!
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If we were talking used motor oil, or brake fluid, or ATF, or any number of other odd oily substances, I could see your point. But this is kerosene for goodness sake! It's a fuel. It's like "diesel lite." It's commonly blended with diesel, at much higher percentages than is being discussed here, precisely to thin it out and lower the gel point in extreme cold. The only possible downside is reduced lubricity, for which there are numerous fine products to counteract, just like a lot of people do when running winter blend fuel anyway.
Seems like burning it in the truck is a perfectly legitimate way to get rid of it, even with the additional cost of a bottle of additive. I believe the original poster was looking for a way to sanely get rid of some leftover kerosene (as opposed to say, dumping it down the sewer), not as a way to save a few bucks, and this is a great way to do it.
Duncan