Timeline for Is shifting to neutral on a decline more fuel efficient than keeping the gear engaged?
Current License: CC BY-SA 3.0
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| Apr 13, 2017 at 12:46 | history | edited | CommunityBot |
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| Apr 28, 2015 at 1:14 | comment | added | Nate Eldredge | @supercat: My understanding is that, for an engine designed with deceleration fuel cutoff, the car will in fact cut off the flow of fuel in this situation. I am not claiming that this applies to every car, but I believe DFCO has been standard (perhaps even required?) for some time now. Cars without this feature would continue to supply fuel when coasting, of course. | |
| Apr 28, 2015 at 1:07 | comment | added | supercat | In general, if one is coasting on a decline the engine will rotate faster than it would in idle with the transmission disengaged. Certainly there is no need for fuel to be fed into the engine if sufficient mechanical energy is available from outside to keep it turning, but that doesn't imply that cars won't needlessly supply fuel to the engine anyway in such cases. Note that it would not be good to merely reduce the amount of fuel; if a given mass of air is being drawn through the engine, the mass of fuel should either have the proper relation to the air mass or be zero. | |
| Apr 27, 2015 at 20:45 | comment | added | Pᴀᴜʟsᴛᴇʀ2♦ | No worries. I think your answer is specific to the question, where the other answer was not specific to this question, but does answer it. | |
| Apr 27, 2015 at 20:44 | comment | added | Nate Eldredge | @Paulster2: Yeah, sorry, after posting I found this had already been answered several times over. | |
| Apr 27, 2015 at 20:42 | comment | added | Pᴀᴜʟsᴛᴇʀ2♦ | I wrote this answer which is exactly in line with what you are talking about. I was going to post about it, but you beat me to the punch. | |
| Apr 27, 2015 at 20:37 | history | answered | Nate Eldredge | CC BY-SA 3.0 |