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In view of the recent high-statistic KLOE data for the $\eta \to \pi^+ \pi^-\pi^0$ decay, a new determination of the quark mass double ratio has been done.Our approach relies on a dispersive model that takes into account rescatteringeffects between three pions via subenergy unitarity. The latter is essential toreproduce the Dalitz plot distribution. A simultaneous description of the KLOEand WASA-at-COSY data is achieved in terms of just two real parameters. From aglobal fit, we determine $Q=21.6 \pm 1.1$. The predicted slope parameter forthe neutral channel $\alpha=-0.025\pm 0.004$ is in reasonable agreement withthe PDG average value.

Three-body final state interaction in $\eta \to 3 \pi$ updated