A blend of rums said to be aged 6-23 years in a 'Sistema Solera' aging process. Ron Zacapa XO is matured at an altitude of 2,300 meters in casks previously...
Thanks, James. It staggers me that food products must declare levels of sugar and other ingredients on their label, but drink products don’t. Like so much else in the world today, this should be changed.
https://www.rumrevelations.com/sugar-list
and the explanatory notes here:
https://www.rumrevelations.com/post/added-sugar-in-rum-list-update
So the answer is the Ron Zacapa Centenario XO has between 19 and 25 grams of sugar per litre.
At least according to the testing carried out by ALKO, the Finnish liquor monopoly.
There is also this piece, which helps to put sugar lists into context.
https://www.rumwonk.com/p/the-problem-with-rum-sugar-lists