Internal Combustion Engines
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads

The engine is rarely operated
The small difference in cooling water temperature or in internal friction has a disproportionate effect
The friction is unpredictable
The friction is high

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Internal Combustion Engines
For the same compression ratio

Compression ratio has nothing to do with efficiency
Both Otto and Diesel cycles are, equally efficient
Diesel cycle is more efficient than Otto
Otto cycle is more efficient than the Diesel

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