[loeg]

Odometers are based on axle rotations; you could game that by running larger tires than stock, for example. There are perverse incentives that are difficult to solve - GPS is imperfect and mandating it is also unappealing from a privacy perspective.

[throwaway316943]

For most cars there isn’t much room to increase tire size but maybe you’re thinking of putting a lift kit on a civic, might be a bit hard to pass inspection.