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Originally Posted by flyingfrizzle
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From what i have read, the Mercury and IIRC some of those other "diesel" engines are technically multi-fuel modified gassers in that that still use spark ignition as opposed to compression ignition. I am not sure they get the same kind of economy, but they do make life easier for military and other big diesel or JP-8 users as they don't have to carry several different types of fuel. You do get like a 10-15% bump in energy density per kg using died or JP-8 instead of gas, so that will make some folks a little bit happy even if they are not getting the much better fuel consumption of a true DI or CR turbodiesel, especially if they are buying "commercial" diesel or jet fuel! Cost wise, the closing of the gap between gas and road diesel may not help us regular recreational use folks as much when it comes to these spark ignition motors because you know that they will cost more.