There are calculators out there for this kind of stuff, in Canada I found https://www.canada.ca/en/revenue-agency/services/tax/busines... and http://caa.ca/car_costs/ both of which strongly point towards 0.5 CAD per km.
Around 0.4 euro/km for long distances.
edit: that articles makes no sense to me. I recall having a minimum charge around £6 in London. How can he have trips paying only 3 dollars?
There are calculators out there for this kind of stuff, in Canada I found https://www.canada.ca/en/revenue-agency/services/tax/busines... and http://caa.ca/car_costs/ both of which strongly point towards 0.5 CAD per km.