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Jet fuel, kerosene, and diesel fuel all have a similar hydrocarbon chain length, so in identical combustion conditions you’re going to get pretty similar emissions. They’re similar enough to the point where they can often be interchanged in the same engine, for instance I know a couple guys who fuel their diesel trucks with Jet A just because the quality is better and they can. What the emissions themselves are depends on a case per case basis, as the combustion byproducts change depending on the combustion rate and temperature. I don’t know enough about the engine in the Abrams, but since it’s multifuel capable chances are the combustion isn’t as efficient as it could be, which is both a good thing and a bad thing for long chain hydrocarbon emissions. I wouldn’t sleep in the exhaust plume that’s for sure.