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We'll find out when people take a test ride in them. Until then, we can only guess whether or not people will buy them. They don't buy very many efficient diesels.
They work on military engines, which don't have to meet the EPA pollution standards that autos do. Diesel engines are more efficient, but are not popular on US cars. What kind of a ride and acceleration will opposing pistons produce? People won't buy cars that are unpleasant to ride in.
A tank or plane has a lot of extra weight to cushion vibration from an engine.
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