Absolutely right. Folks get worked up trying to get precision accuracy for what's inherently an inaccurate measurement. Worrying about a difference in rollout of 2005 vs 2010 is quibbling about a possible error of 0.25% when real world variables are far more than that.

Back when I used an odometer (don't bother any more) I entered a decent approximation of the wheel rollout. Then checked my readings against the mile markers along the road, and adjusted the figure slightly based on the comparison. After a while, I simply stopped caring and when the battery died, I scrapped the unit.

If I go on an extended tour in an unfamiliar area, I'll probably buy another simple unit (speed distance & time) so I can navigate using maps (if they still print them). Super accuracy doesn't exist or matter.