Interestingly, basically the same slope is observed for the viscosity. Thus, in the whole range of salt concentrations the inverse viscosity is strictly proportional to the diffusivity. In analogy we checked the dependence on the EC:EMC ratio for the 0.95 M composition, see Fig. (b). It is seen that the viscosity increases by approximately a factor of 3 when comparing the 0% EC system with the 76% EC system. In literature it was reported that the viscosity (for a similar salt concentration) decreases by a nearly temperature-indendent factor of 1.66 (T = 313 K) to 1.84 (T = 283 K) when comparing the 0% EC system with the 30% EC system for a range of temperatures. A factor of slightly smaller than 2 is fully compatible with the variation of the viscosity from our simulations. Naturally this increase is directly related to the higher viscosity of the pure solvent EC as compared to EMC (approximately a factor of 3 at T = 313 K). We note in passing that in the advanced electrolyte model knowledge about some specific microscopic features allows the prediction of the viscosity of electrolyte mixtures. When comparing the data from Fig. ) and Fig. (b) we have to conclude that in contrast to normal expectation an increasing viscosity goes along with an increasing ionic conductivity when changing the EC:EMC ratio. This is quantitative agreement with the experimental data reported in. Qualitatively, this is a consequence of the higher EC viscosity as compared to EMC and the higher dielectric constant of EC, giving rise to more independently moving cations and anions. However, for a more quantitative discussion a direct comparison of the viscosity and the ionic conductivity is not as informative as the combined comparison of the viscosity with the N-E conductivity (see also Fig. ) and the N-E conductivity with the ionic conductivity. The second comparison allows one to clearly identify the impact of ionic correlations, as already discussed above. The first comparison, however, deals with the relation between viscosity and cation/anion diffusivity and thus contains the information to which degree a change of viscosity as a collective phenomenon impacts also the single particle dynamics of the cations and anions. For the specific case of the EC:EMC variation we may thus conclude that the viscosity is reduced due the different EC vs. EMC viscosities but that this variation has hardly any impact on the diffusive dynamics of the salt constituents.