Pack version: 3.1.2

Hi,

Currently the energy density of Gasoline is wildly different between Simple Generators (1200 FE/mb) and Advanced Generators (51 FE/mb). I propose to align both to 1200 FE/mb: Gasoline is supposed to be roughly as energy dense as Diesel (in this case, it would be a little more, justified by the refinery step).

Thanks in advance.