May not be relevant anymore as of SE 0.6.121's fuel rebalance changes.
Old description as follows:
This rebalances Space Exploration's changes to the way Krastorio 2 handles the creation of certain rocket fuel types, making it still harder to make them, but not as hard as what was intended by the SE developers.
In the original calculations, for example, you would require 180 thousand stone per minute to produce a single yellow belt (15/s) of hydrogen chloride rocket fuel, which to me seems largely unintentional, something that would require nothing short of a huge base, and that's not even counting the number of machines required for that whole process.
Thus, with this mod you can select (via startup settings) to have the following changes added to your Krastorio 2 + Space Exploration game:
Reduce the amount of oxygen required in the standard rocket fuel recipe
Reduce the amount of oxygen required in the vulcanite rocket fuel recipe
Enable Semi-Vanilla K2 ammonia rocket fuel production values
Enable Semi-Vanilla K2 hydrogen chloride rocket fuel production values
Enable Semi-Vanilla K2 Wood and Biomass Conversion