We present production data on operation of reactor blocks in reformers. We identify the typical behavior of the change in temperature differential in the reactors as the reactor run time and the ratio of the catalyst volumes in the reactors are varied. It is shown that the n-paraffin content in the reformate corresponds to the temperature differential in the reactors. We propose parametric equations for calculating the octane number of the reformate for known aromatic hydrocarbon content in the reformate and known density.