I cruise around 65 to 70 when the road, and the law, permits. I can get up to 55 if I watch my right hand. It drops to as low as 45 with a full load, some headwind, and I lose control of my right hand. I am left handed naturally, so the right does get away from me once in a while. On my last long cruise - from San Antonio to Palestine - I had saddlebags, topcase, tent and bedroll and dropped to somewhere between 46 and 50.
We've gotta meetup sometime, Sissy Mary. You don't live that far from me, I think.