I've mentioned this before, but 16, 17kph has pretty much been an average speed for a majority of my trips over the years. Sure a little faster some days or a little slower others in mountains, but I still pretty much use it as a guesstomator for seat of pants reckoning of routes.
The weather looks like it was nice. You may recall I have a Caravan, the light tourer, bought I think in 91. Once in a while I figure I should sell it, but never do...
Cheers