Mileage > Information Source
The D stands for diesel, which represents 30-50% of the European market simply for its markedly improved fuel mileage figures, when compared to regular fuel.
This index is essentially the opposite of the octane rating, where a high octane fuel resists spontaneous ignition, and therefore does not tend to ´knock.´ The cetane number of 100 was arbitrarily assigned to ´cetane´ or n-hexadecane, a straight-chain aliphatic chemical compound that burns very well, in the single-cylinder test diesel engine.
Most rewarding is the 300D´s limited thirst; its incredible fuel mileage of 30+ mpg is mindboggling for a full-size automobile.




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