The Garmin 24k Topo map set I recently bought on a good black Friday sale does indeed offer routing capability. I haven't looked a all the rest, but the Northeast one does. Note the 6th bulleted item under Features: https://buy.garmin.com/shop/shop.do?pID=35411
Also, I believe that Garmin has moved over to using Navtek data for their topo map sets, according to their CS people.
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