There is NO requirement I report my total mileage for the year to the government.
For both the registration, and the inspection, the mileage is reported to the government. The states are required by the federal government to get a report.
Yes, there is a constitutional requirement. Article 1 section 9 specifically prohibits all ex post facto laws. You can't pass a law that is retroactive.
Making a requirement to drive a car on future roads is not "ex post facto", even if the car is from the past. It would be like claiming that you can use a gun made before a murder law was put into place to murder people. Heck, pretty much all rocks predate murder laws... Does that mean rocks are legal to murder with?
On old cars that are pre-electronic, the odometer is mechanical and driven by a gear and flexible rod assembly. Disconnect it, and the odometer stops working, usually along with the speedometer.
It was usually made tamper resistant... But even if you could get away with it, you would be driving a car that is a federal felony. Worse yet, you would not know how fast you were going, and probably get pulled over for speeding.
One of the Big Three car companies used to drive new cars for a few months with the odometer/speedometer disconnected. People served felony time over that.
Odometer fraud only applies to sales of the vehicle.
It is currently assumed that all vehicles will one day be sold, and the reason for the odometer fraud is for a future sale. If there is state and federal taxes on the odometer reading, then it will be assumed that it is tax fraud.
So you have federal odometer fraud, federal tax fraud, and state tax fraud. Because they are in three different areas, they will not be served concurrently. That means you are going to serve at least 3 years in prison.
Is it really worth it?
Federal laws still apply in Arizona.
If you check the box "Mileage in excess of odometer mechanical limits" then that's that.
So all you have to do is drive a million miles a year, and it will register as zero miles? That would require you to drive 115 mph, every hour of the year. It is physically impossible. So if one year, you have 990,000.0, and the next year you have 010,000.0, then everyone knows you drove 20,000.0 miles that year. See how it works?
This too absolves you of any criminal charge.
No, it says that something happened. The only way to "absolve" you of criminal charges is to either explain what happened was no one's fault, or that it was someone else's fault.
So, disconnection isn't a crime unless you intend to defraud a buyer when selling the vehicle.
Or commit tax fraud? Remember, you want to commit felony tax fraud.