Quote:
Originally Posted by aardvarcus
I used to put my car back in gear when I didn't need speed to allow for engine braking, but after I got my gauge I realised that it used more fuel to have the car in gear engine braking than in neutral using the brakes when needed. I did this testing with the car warmed up, I am not sure about the car being cold. I no longer use engine braking, but your car may be different.
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Generally when slowing the engine should go into DFCO when warm, basically the injectors cut off and the car's momentum turns the engine over - 9999MPG on a gauge.
Some engines have a minimum RPM for DFCO (my Toyota Aygo does this only when the RPM is over 1400). Being in gear means you slow more so sometimes (to maintain momentum) you are better being in neutral and on the idle program - or (if brave) you select neutral and shut the engine off.