Most likely he used a manufacturer R&D exemption to do it. This is fairly common, just usually not as high profile as the CEO.

Maybe the same way Steve Jobs did the no plate thing. Maybe he just keeps cycling them. Might even send them to the labs at Ford for destructive analysis after each one is legally done.

https://www.legislature.mi.gov/Laws/MCL?objectName=MCL-257-2...

Sorry but was this truly a good faith question? Kind of hard to see how it is.