Dog training question.

I have a 70 pound mixed breed dog ( looks like Shepherd/Lab/Doberman cross; handsome sob) that I let run about 3 miles every morning, at between 15 to 25 mph; his natural speed being about 20, but he can hit 30. After this he's gets breakfast and lays down,all pooped out.I know his schedule because we created it by timed feedings. Sometimes I don't see him until supper time, and sometimes we'll go out for an evening walk. This is our first dog. My wife named him Georgie, but I call him Mr.Mellow.In town, he's everybody's favorite dog, and he likes their affection too.
He knows about 13 commands, and responds properly to about 13 other communications. He listens very well,and also knows by my tone of voice if it is a command or a request. Commands are always preceded by his name, and are enforced; but to requests, I use no name,and he is free to respond in any way. And lots of times he says no thanks.
And believe it or not, he knows the difference between STAY, and WAIT. Stay is hold your position. Wait is; hang around here until I return; you can SIT, STAY, LIE DOWN,HOLD STILL, whatever; just be here when I get back. So, I more or less don't use STAY anymore.
We got him as a 3year-old chicken-killing escape-artist, from a shelter, going on 3 years ago. They kept him inside because he was known to climb up out of the 8-ft chain-link fence of his outdoor enclosure. In the last year, I can't recall leashing him more than a couple of times, and only as show to others, that supposedly I'm in charge.
I claim everything in town, and he won't even pee on any neighbors lawn, much less ours. By claiming everything, he knows he can't touch it. Don't ask me how he figured that out. For Georgie; claiming was simply standing between him and the thing he wanted, no talking. Then advancing on him until he sat down. Surrender/understanding was observed when he either yawned or lay down on his side, all four legs out in sleep mode.
And, of course, we have play times, and grooming times, and bathtimes; the last of which he is not fond of, but he is obedient.. I am starting to understand some of his body language. After 2.5 years I suppose it's about time,lol.

My only advice is ; Exercise, discipline, then affection. I use no treats, never have. The affection and grooming are the treats. A tired dog is a happy, obedient dog.
That's the best I got, and don't know if it works on all dogs.

Oh and mostly no talking. Dogs do not understand much language other than body language and their understood commands; talking only excites them, mostly in a negative way. This I know works on every dog I have had the occasion to get to know; dozens since we got this dog.That, and don't approach straight-on; be polite, doggie-polite. Come close alongside,stand sideways,then wait; let them come to you. After all, in their world, you are a GIANT. And one more; the smaller the dog the sooner the bite; never trust the sobs. If it's yapping, the teeth are already warmed up.