A transport analysis is reported of a series of discharges in the Rijnhuizen Tokamak Project (RTP) tokamak, in which Zeff was varied by using mixtures of helium and neon as the filling gas. Zeff was scanned over the range 5.1 to 9.5. As a reference, pure deuterium plasmas with Zeff ≲ 2 were used. Only a very weak dependence of χe on Zeff is observed, both in ohmic and in ECH discharges. The scaling of χe with ne and Zeff is consistent with the scaling of the global τEe, both showing an absence of scaling with Zeff. Scaling with the collisionality shows χe ~ νe*0.4 in ohmic discharges. A comparison is made with the predictions of transport models. Some models correlate with either the ohmic or the ECH data set. None of the tested models, however, predicts the observed Zeff dependence of χe in both ohmic plasmas and during ECH. It is noted that the ohmic discharges are in the plateau regime, while the ECH discharges are largely in the banana regime