I dropped into the place I get these overnight logs, a very good compressed log and they have a newer product, the new logs are 4" x 13", about 30% bigger than the older logs. The old ones were priced at $6 for 4 logs, the new ones are $6.25 for a 4 pack, only a quarter more for about 30% more log. I picked up 4 packs to try them out. I put on in my afternoon load and it raised the temp quite a bit over a just wood only load, I just raked the coals for another reload and the original log is about 75% gone, not too bad for 10 hours. Im going to try a couple on a real cold night and see how well it keeps the temp up on an overnight burn.