Correlations among lattice parameter. external pressure, and critical temperature T-c has been surveyed on fullerene superconductors with a wide range of lattice parameters and various valence states. The observed value of dT(c)/dP for Na2Rb0.5Cs0.5C60 and Li3CsC60, having small interfullerene separations, is about a few times leger than that of K3C60. In contrast, small dT(c)/dP: values are found in fullerides with expanded unit cells, such as (NH3)(x)NaAA(dagger)C(60) (A, A(dagger) = K,Rb and Cs) and A(3)Ba(3)C(60). Interestingly, the chemical and physical pressure effects on T-c are considerably different in these fullerides with large interfullerene spacings. Our results suggest that the pressure dependence is scaled by an interfullerene distance when the interfullerene distances is small, but that this scaling fails when the unit cell is expanded.