FUEL: REFUELED is an enhancement modification for the game FUEL, which brings multiple bug-fixes, improvements and the addition of various new content.
Because of the range of options available in V15.2 (with more to follow), I've taken a screenshot of an example installation via the mod manager. The point being that you are required to install all four parts... A,B,C and D. But cannot install two parts of the same letter at the same time - i.e. B.1 and B.2 wont work. This allows you to customize the installation easily and switch between setups depending on how you want to play.