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.
Sonex intends to conclusively demonstrate that SCS-SCRI will enable GDI engined vehicles to achieve 50 mpg (highway) while meeting emissions standards to permit sale in the State Department of Taxation officials have announced that state standards are the same as federal standards for mileage rates for computing deductions for operating automobiles for business-, charitable-, medical- and moving-expense purposes.
Other than the obvious difference in the fuel requirement, the TDI is a remarkable little engine.
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