Abstract A series of Al 70Pd 22.5(Re 1− x Ru x ) 7.5 quasicrystals with x=0.13, 0.2, 0.4, 0.6, 0.8 have been prepared. Replacement of Re by Ru is seen to decrease the resistivity and the resistivity ratio r=ρ 4.2 K /ρ 300 K . The magnetoconductivity (MC) of the samples with r≤10.3 was analyzed using the quantum interference theory. The obtained results suggest that a more resistive sample suppresses not only the weak localization contribution but also the electron–electron interaction contribution through the reduction of the g ∗ value. For the samples with x=0.2 a and 0.4 a , the observed positive MC at low fields and low temperatures indicates that these samples are already in the hopping regime. However the anomalous behavior concerning the decrease in the magnitude of positive MC with decreasing temperature is in contradiction with the theoretical predictions.