sga tuning

 Based on the values below am I correct in assuming that the sweet spot is having an sga size of 45056 which gives the lowest dbtime?
SQL> select * from v$sga_target_advice;

  SGA_SIZE SGA_SIZE_FACTOR ESTD_DB_TIME ESTD_DB_TIME_FACTOR ESTD_PHYSICAL_READS
---------- --------------- ------------ ------------------- -------------------
     22528               1        39276                   1            65529967
      5632             .25        47304              1.2044            67954576
     11264              .5        40918              1.0418            66027995
     45056               2        35537               .9048            64402852
     28160            1.25        38844                .989            65398907
     33792             1.5        38710               .9856            65359589
     39424            1.75        38471               .9795            65287506
     16896             .75        40046              1.0196            65759322


Thank you
Ed