I rode unloaded around Cherry Creek Reservoir on Friday. A 60-mile round trip mostly on city bike trails for me. Your loaded speed sounds about equal to my unloaded speed. Nice work. Nice bike, too.
I had been considering an overnight shakedown to Chatfield, about the same distance for me. But I saw on Friday that there's a lot more shade at Cherry Creek. Your picture of your campsite tells me the same thing. Which campground were you in?