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Recent analyses of flavor-breaking hadronic-$\tau$-decay-based sum rulesproduce values of $\vert V_{us}\vert$ $\sim 3\sigma$ low compared to 3-familyunitarity expectations. An unresolved systematic issue is the significantvariation in $\vert V_{us}\vert$ produced by different prescriptions fortreating the slowly converging $D=2$ OPE series. We investigate the reliabilityof these prescriptions using lattice data for various flavor-breakingcorrelators and show the fixed-scale prescription is clearly preferred.Preliminary updates of the conventional $\tau$-based, and related mixed$\tau$-electroproduction-data-based, sum rule analyses incorporating B-factoryresults for low-multiplicity strange $\tau$ decay mode distributions are thenperformed. Use of the preferred FOPT $D=2$ OPE prescription is shown tosignificantly reduce the discrepancy between 3-family unitarity expectationsand the sum rule results.

Lattice Input on the Inclusive $\tau$ Decay $V_{us}$ Puzzle