Back to the bakers dozen, all my customers/friends get extra. I used to cut all of my wood at 16" and made racks to stack it in. Then I switched to 18" and was too lazy to adjust my racks. Besides I only sell a few cord because I like cutting and splitting wood, and I only sell to friends. I call them "Fat" cords.
I know I've told this story before, so sorry for the repeat. Back when my Dad was in business, and we did sell more wood on a commercial basis, we also cut wood a head of time for regular customers, in custom lengths. We had a Ford F600 dump with 12' bed and 6' steel sides. I measured the cubic footage for 18", 20", and 24" wood and painted color coded lines on the sides, so one row was half a cord, 2 rows a full cord. It was the last load of the season and I was taking it to a new customer. On a whim, I called him and told him I had his cord stacked on the truck and was ready to leave. But, I had a big pile of odd size cut off's I was going to put on the burn pile. If he wanted them for free I'd throw them on the truck. He said sure. I got there, showed him the load before I dumped, he said OK. The next day I had a complaint, I had shorted him. He took the shortest piece in the pile and some how averaged what the whole load would be. He said I shorted him, I'd only given him something like 138 CF, and I owed him 144 CF. I said 4X4X8 equals 128 CF. I could hear him punching the desk calculator, then the phone went dead. He didn't bother to say OK, I'm sorry or "Well kiss my+++", he just hung up. That's when I quit giving shorts and uglies away. I still throw them on my burn pile, now with a bunch of my friends around and some custom beer.
Not long ago, my cousin heard me tell this story and said, "I always wondered what those different colored lines were, now I know." When my Dad retired, my uncle bought the F600 and one of our chippers.