this post was submitted on 08 Sep 2023
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Using engine brakes can cause your car to not use fuel in some cases.
I've read and heard this from different sources (even driving instructors) and I don't get how it's possible. Your engine is still running, doesn't it use at least as much as it does while it's idling?
Edit: thank you all for your answers. I knew how the engine brake effect worked, my confusion was about exactly why the engine didn't consume fuel in the process. I now understand so thanks all.
For the car to be "running" in those cases, the engine just needs to be turning to keep the alternator and potentially the power steering pump going. When engine braking, the rotation of the tires is locked to the rotation of the engine, so the inertia of the car keeps the engine turning without needing to use fuel.
Depends on the ignition system and everything of course, but it can be true.