First of all, understand what is engine braking.
Once you understand it, see this youtube link from Engineering Explained.

https://www.youtube.com/watch?v=_bZlb62VVlw

There is 1 exception unless your car is older type which use carburetor, then it will consume higher fuel as it is not control by ECU.
But modern rides, usually will cut off the fuel when doing engine braking.

This post has been edited by littlefire: Oct 25 2021, 09:16 AM

Per video from Engineering Explained, the engine cuts the fuel injection when the car moves down a hill; at various times, the engine will use no fuel at all to power the engine, since the wheels themselves—connected to a transmission—make the engine spin.