Internal Combustion Engines
Diesel fuel, compared to petrol is

Less difficult to ignite
Highly ignitable
Just about the same difficult to ignite
More difficult to ignite

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

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