Any background / literature you're aware of on this?
At what point do uncertainty effects (limits to measurement precision) and risk (danger of rolling "over the top" of the L2 point, and requiring reverse thrust, which JWST cannot deliver) come in to play?
With future tech and more research, we will be able to use the fuel it has far more effectively.
the theoretical fuel use is zero... The actual use is proportional to how our calculations of orbits and stuff differ from reality.