Using a series of response functions generated from single particle geant simulations and integrating the jet finder algorithm, I took each pythia jet and found it's detector energy. Below I plotted the ratio of (E_det - E_true)/E_true.

Below is the same ratio as a function of E_true. Obviously, can't see much here.

Here's the profile in energy bins. The profiles are normalized to the integral. The lowest energy bins are the lightest colors and the darker colors are higher energies. This plot goes up to 40 GeV.

Means for every energy bin.