Randy wrote:

If you really want to cheat, you buy another idnetical instrument
cluster at the junkyard and swap between the two. Suddenly you aren't
racking up nearly as much mileage.

The odomoter is in the engine computer, the instrument panel is just a
computer display of sorts, these days.
If they try anything like that, it will quickly be hacked.
Yes, certainly, but it may be getting harder to do that.

Jon