Do I have to have ***spoiler*** here?
The best I've ever done was two knocked out K.T.'s with my T-34 untouched.
I got the first when he sped down the road and stopped at the bend (why?).. that took only 2 shots. One went through the rear hull, the other went through the rear turret and 4 of the 5 crew were dead.
The second was a lot tougher, except the AI made a stupid move. I actually got shot at by this one (he had moved off into the field "north" [i think] of town, and I was sitting between the two start buildings waiting for him to blunder into my sights). Well, a'blundering he went, but my T-34 didn't kill him with the first two shots. Wisely, the T-34 backed up and moved behind one of the buildings. The stupid K.T then proceeded to the road not 20 yards from where the first one died, and stopped. He was at a slightly different angle (showing his side instead of his rear) but my T-34 shot him about 7 or 8 times before the crew bailed.
The last K.T just sat on the road and wouldn't move, I ran out of time trying to manuever my T-34 over to kill him.
Usually my T-34 targets a K.T. misses, misses, and dies, so that was a fun run through for me.