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Yes, I think you are exactly right. The difference is the TDI is more light duty than a semi, can make enough torque to bend rods, and redlines at 4600rpm. My friend has one that makes 220hp and revs to 6000rpm+ so you can drive them like gasoline cars.
In terms of friction, we know it is best to keep rpms low. On the other hand, too low at too high load causes damage. I thought gas engines were better to accelerate at low load. Maybe this pertains to automatics to lower the shift points?
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