My wife's CX-5 is seeing lots of short trips, and indeed the oil level goes up. Used oil analysis shows fuel dilution, as expected.
Reading about this I came across the condition that is called Low Speed Pre-Ignition, LSPI. Evidently, this only affects DI engines and is much more detrimental then regular pre-ignition that causes pinging. LSPI can't be detected by the knock sensor, so OEMs are dealing with it by dumping fuel under conditions that MAY cause LSPI, making it impossible to happen. Hence, most of the DI engines have fuel dilution problem, the fuel just burns off during long drives in fully warmed-up engine. No such luck for us short-trippers...