Just read through this thread.As far as I recall (and you would have to trawl the archives) the “standard” jump drives in book 2 are the most efficient drives you can get in CT.Which suggests, and what I believe the consensus of the list was, that they are all built at the best tech level they can be (TL15), and then shipped to various shipyards as “standard” drives you can just buy “off the shelf”.