The oil temperature in our CX-5 rarely goes above 90C, even during a day-long driving on the highway, and it takes about half an hour to get there. This is barely enough to gradually evaporate gas and water out if the suspension in oil. With city driving or short highway runs, the oil temperature stays way down in 50-60C range, even less in the winter. That's not enough to persuade gas to evaporate out of the oil in a rush. It keeps coming faster then it evaporates.
Regardless, there is no tangible evidence that fuel dilution harms the engine in any measurable way. Lots of UOAs from our engines and competition on bobistheoilguy.com, all look great by wear metals. People there that run premium on the regular basis report no or reduced fuel dilution, which makes sense, at least theoretically. I'm just too damn cheap to try it myself...