Mil and mile

As previously mentioned, Swedes use the metric system.  So when I heard Swedish friends speak of distances, and they referred to what I thought were "miles", I assumed that they were using the same term Americans use representing 5280 feet.  Nej.  They were not.  They were speaking of the Swedish "mil".  Although, at least to my ear, the two words sound the same, they represent two different things.   A Swedish mil equals 10 kilometers.  This could have been a  problem if I had agreed to take a 5 mil walk...