Is shifting to NEUTRAL saving fuel/pollution? 2008 Expedition

Ya drive 110 mph ONE time and get labled for life!
Funny.
All who have purchased my vehicles are still very pleased.
They continue to run well - except for one replacing an alternator, another a water pump and another a failed Prestone inline plastic garden hose connector used to flush the cooling system.

No transmission problems and fluids are still clean.
The suspensions still seem tight. But does that mean anything?
I have been unable to detect wear and tear caused by tires inflated to their published maximum 44 psi.

But I also drive gently, accelerate gently, brake gently, avoid potholes and such, avoid sharp turns, so could I have compensated for the harder tires?