In D-4 direct injection, fuel and air is injected directly into the cylinder, instead of mixing it in the intake port which is how conventional fuel injection works.
Fuel having a high ´natural´ cetane number obtained through high energy paraffin content may provide better fuel mileage than lower energy fuel or fuel with poor natural burning characteristics plus a cetane improver, if ambient temperatures are adequate to prevent gelling of the high paraffin 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.
Ford began to change last summer, when as part of the Alliance of Automobile Manufacturers, he threatened to sue California over the nation´s first-ever legislation to reduce vehicle greenhouse gas emissions.
Fuel mileage with the stock chip had been a consistent 43 mpg.
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