Very interesting! I too have a 2012 Skyactiv 6MT. Same exact thing you're all describing happens to me. I never thought about the a/c. It makes sense that if the clutch were depressed, that maybe the engine automatically accelerates to keep the a/c going?My local dealer has been in contact with Mazda Canada (and their tech support and engineers). Everyone seems to be very interested in the positioning of the HVAC controls. Now I am trying to keep track of whether the A/C is on or off, what location is the air blowing, is the fan on or off, etc. Hmmmmmm.
I also seem to be experiencing the surging less often. Makes it very hard to diagnose. It has been ~ 2 weeks since it last happened. Of course it did not happen when the dealer had the car for a week.
Has anyone else gone to the dealer and have any ideas what could be the issue?