Please give us a way to access fuel per stage (if I can get # of stages and loop through them, I'll write and post the lua to total it up). either kg or L is fine, but we'll also need to know the density of the fuel (the rocket equation only works with mass, but the GUI only reports L).
Ideally report all fuel types available individually, but the stock types (solid, liquid, aerospace, RCS) are more important, since everyone has or had them.