I’ve never heard of cars in Scandinavia using that measure. Hint: I grew up in Scandinavia in the 80ies.

The Scandinavian Mile[0] exists, but it's not a thing in Denmark - just Sweden and Norway. There is a separate Danish mile, but I've never heard anyone talk about it in Denmark, although you can still find the odd mile stone [1] using a mile that's different to both the Scandinavian one and the UK/USA one.

But yes, using the Scandinavian mile for a car's odometer would be strange even by Swedish standards.

[0] https://en.wikipedia.org/wiki/Scandinavian_mile

[1] https://da.wikipedia.org/wiki/Milep%C3%A6l

They don't, the odometers measure kilometers. The "mil" (10 km) is simply the smallest distance we care for in terms of a car's state.

I think 45k miles is just a way of saying 450k kilometers. We use the term "mil" a lot (1 mil = 10 km), but easy to confuse it with miles when using it internationally / in English.

No they are always in kilometers (and sometimes with one decimal), but in Sweden we never really discuss individual kilometers in terms of a car's usage, only Scandinavian miles ("mil") - one of which is 10 kilometers.