That’s some crazy example, not something 99.9% will never experience. And it’s minimal at best. And in all honesty that’s easily adjusted for. It’s not the stereotypical thought of the PVCR feeding the engine at idle.
I never did say it was the common misconception of PV can't be below idle vacuum... you asked for a way it could happen and I referred you to the link. "Never say never" :poke: