Like, what is the mechanism that slows the car considering the hydraulic brakes aren’t involved at all? How does it vary by transmission type (manual, regular auto, CVT)?
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An engine is just an energy system. If you put in gasoline and air and spark the mix, it outputs energy into the crankshaft and it spins the wheels.
If you don’t put in any of that (i.e. you let go of the throttle), the system starts requiring energy instead mainly due to the throttle closing and there being no air pumped into the engine anymore. The engine has to spend energy to work against the vacuum that is created, which slows it down.
Just imagine an engine cylinder having to do a full cycle without any air. It’s the same as if you plugged the end of a tube syringe and tried to pull the plunger: it takes effort. That energy is fed back from the wheels, which slows them down.
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