There is no real break-in period with the new engines. They all use an alloy of aluminum and silicon (as in quartz) to give ultimate wear resistance to piston rings and all give about 250,000 miles of service. The American made motors give as good if not better performance than that of the foreign competitors. The reduced gas mileage due to tight new motors is near minimum. The lubricants used now are much thinner due to higher tolerance in part wear surfaces and the lubrication is instant from the factory.
The color of paint does not affect gas mileage in any way.
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.
Yes.
If it is malfunctioning it can affect fuel mileage.
Yes. Yes it does!
yes
YES YESYESYESYESYESYESYES
incorrect tire inflation
the lower your rear axle ratio, the worse your mileage.
All of the engine sensors can affect fuel mileage.
Yes.Yes.
yes