I would use the common dataset for UCSD which uses the unweighted GPA and gives the SAT score ranges. The data for the common dataset is for enrolled in-coming Freshman and transfers. Again as the other poster pointed out, it could be a difference of applied/admitted and enrolled.
I could not find the common dataset for 2014-2015, but average last year was 4.0 unweighted with 92% at or above a 3.75 GPA.