Why is Ford Focus maintenance scheduled every 5000 km in canada and 5000 mi in US?

conversion ive been driving 50 yrs al most ive had a hundred cars maybe more and only two has not let me down as much as any other ford and nissan been best with my hard driving style ..conversion woul dbe reason numbers differ
 
5000 is an easy number for people to remember and canadians use kilometers and americans use miles. Its just a recommendation for maintenance.
 
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