I did a modest 2.5Km ride, uploaded with Garmin Connect and then tried to see how far it was in miles instead of kilometres. I did this by selecting 'full edit' to display the data then selecting miles instead of kilometres. The conversion did not seem to work so I tried a few more times - saving each time. The data now shows I did the trip at 111K/hour! The more I try to convert to miles the greater the distance I travel in the same time! See attached screen grab.
Ray