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The 30-40% turbines are the old design that date back to when diesel motors achieved similar numbers or worse. So diesels have evolved and improved and you yourself have pointed out so have the turbines even though much less attention is spent on them. So even the old simple turbine design is not bad thermal efficiency especially comparing it to a truck diesel operated at all kinds of rpms and loads. Now start using this concept's power plant in millions of trucks for 25 years and watch how much better turbine designs get.
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