Indirectly I believe it may actually or more correctly stated, nox2 directly measures nox levels and allows for a more precise urea dosing control based on the conversion efficiency of the catalyst and this allows the engine to run leaner and achieve better fuel economy.Def is injected after the engine and into the exhaust. Hints diesel exhaust fluid. It will in no fashion affect fuel economy. What will affect fuel economy is and not limited to. Fuel quality, your foot, air temp, engine temp, stop and go vs highway driving, If your in a regen.. that’s a big one… how loaded you have the car, dirty air filter, oil weight, tire pressure but def does not help propel the vehicle in any fashion so it can not help or hurt mpg. Plus. The tank last right at 10k miles. Who here keeps up with a 10k avg mpg? And rests every full up and tries something different? Please don’t spread bad info. Check ISO 22241 and you will learn about def and how it works
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Def Platinum, who knows. But the scr system is designed to always maximize the conversion factor to meet emissions and burning less fuel ie: better mileage, is a part of it.