I pretty deliberately said 'while driving', but that illustrates what I'm saying about just stating random numbers related to 'regular' operation. Without solid information relating to airflow, boost, load, speed, etc., it's very difficult to get a general idea of intercooler efficiency. Part of looking at a datalog is being able to isolate the fact that from 'a' to 'b' the car was under a relatively comparable (across the board) workload.