yes
All of the engine sensors can affect fuel mileage.
Tires do not have oxygen sensors. They can have pressure sensors. The lack of pressure sensors would have no affect on fuel economy.
causes very poor gas mileage
A bad O2 sensor can affect gas mileage. It is an emissions sensor, so when it goes bad, it does not reflect emissions performance on the car, which could cost a lot in gasoline.
Yes.Yes.
Absolutely. Not just on Subaru but every car built that has an oxygen sensor. And they all do.
No it will not give you better performance or increase gas mileage. Gas mileage and performance will decrease only if you use it. leaving it off is like not having it at all.
The color of paint does not affect gas mileage in any way.
YesYes
You can optimize your vehicle's performance and achieve better gas mileage by using a performance chip. These chips can adjust the engine's settings to improve fuel efficiency and overall performance.
Yes, the faulty power steering pressure switch does affect the gas mileage. It will give a wrong reading of the gas mileage. It is therefore important to fix it when it is faulty.
No, does not work.