AdBlue is usually made from natural gas, so one has to figure the CO2 it takes into it. It should be able to use less diesel fuel, but I don't know if the reduc

AdBlue is usually made from natural gas, so one has to figure the CO2 it takes into it. It should be able to use less diesel fuel, but I don't know if the reduction there is worth the increase in AdBlue use. The hotter the engine burns, which in this case should mean the higher the compression/inlet pressure is, the higher the efficiency, as well as the NOx levels generated. The impact of particle filters on engine efficiency is not know to me.