Internal Combustion Engines
A fuel of cetane number 40 has the same ignition quality as a mixture of

40% alpha methyl naphthalene and 60% cetane
40% diesel and 60% petrol
40% petrol and 60% diesel
40% cetane and 60% alpha methyl naphthalene

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

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

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