All non-isomorphic CA^*₁(7,2,3)s, the number of runs, a lower bound for D-efficiency and D-efficiency ordering (.n means that the design ranks number n in the D-efficiency ordering):

Covering Array             Number of Runs             Lower Bound and Ordering  
CA^*₁(7,2,3).1                         12                                    (100%).1
CA^*₁(7,2,3).2                         12                                    (95.6793%).2