I don't think so...because, when 'original' Pongo media lib files are used (or that one I posted earlier), when unit is set to kilometers, all is fine, but when set to miles, I get the same as you did: "The speed limit is miles". I believe the error is somewhere in the modified lib files as pertains exclusively to the overspeed section..one or the other of miles/kilometers (or substitution of same) is not coded exactly correctly..in the original files within the data.zip, overspeed works correctly for both KMH and MPH (but no camera distance, of course). Whether it is worth fixing (or issue one version for Miles and another for Kilometers), I don't know..that's up to you. It does not bug me much because I use KM exclusively (and the lua files that work with it), and only tried Miles for testing.
But anyway, here are the relevant lines in my dictionary.voice file just so you know:
The speed limit is %s!="The speed limit is %s! Slow the {expletive deleted} down."
km/h="kilometers per hour"
km="kilometers"
mi="miles"
mph="miles per hour"
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