Because of the better part-load efficiency, the CO2
emissions are around 20% lower and the fuel economy is
typically 25%–30% better than for gasoline engines. For
diesel engines, a peak efficiency of 44% is currently the
state of the art, with 36% achieved for gasoline engines.
The specific power output of diesel engines is increased by
turbocharging and reaches a level up to 75 kW per liter
engine displacement (e.g., passenger car: 3.0 L, 225 kW).