01-30-2015, 03:01 AM
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#1 (permalink)
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EcoModding Apprentice
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coasting in gear or in neutral
so was going to ask which is more efficient but did some homework and found that it is more FE to coast in gear rather than neutral in a manual car. I will be changing my driving stile accordingly. I can understand if it is a slight downhill the engine braking might cause you to get on the gas a bit sooner. but I live in hilly terrain so a steep downhill is 90% of the time followed by an incline so I need to get on the gas sooner anyway.
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01-30-2015, 11:00 AM
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#2 (permalink)
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Batman Junior
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Generally, coasting in N is more efficient because you get off the gas earlier, and coast further. The additional coasting duration offsets the tiny amount of fuel used idlng during the coast vs. fuel cut in deceleration fuel cut-off mode.
Letting off the gas in gear is good if you are (a) trying to slow down or (b) trying to hold your speed down a grade.
Unless coasting in N has me going too fast at the bottom of the hill, that's what I'll do.
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01-30-2015, 02:58 PM
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#3 (permalink)
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Administrator
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Ditto, coast in neutral. In gear slows you down way too fast.
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03-04-2015, 03:56 PM
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#4 (permalink)
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Experienced UAW Mechanic
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Coasting in gear or not seems to depend on how far you'll be coasting. For 100 yards, maybe in gear is good. But a mile or more, I say it's excessive RPM, hence wasting fuel.
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03-05-2015, 03:04 PM
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#5 (permalink)
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Chief Cook & Bottlewasher
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Coasting in neutral is more efficient for the reasons and for the situations described by MetroMPG. Better still, if you have a manual, is to shut the motor down while coasting.
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03-05-2015, 07:03 PM
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#6 (permalink)
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Experienced UAW Mechanic
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Quote:
Originally Posted by campisi
Better still, if you have a manual, is to shut the motor down while coasting.
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Blatantly illegal. |
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03-05-2015, 09:10 PM
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#7 (permalink)
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Chief Cook & Bottlewasher
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True, but the statement stands. Is it blatantly illegal for hybrids, too? I honestly don't know the answer to that question.
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03-06-2015, 12:40 AM
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#8 (permalink)
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Master EcoModder
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It's not illegal for hybrids to do it to themselves. Not quite sure about whether it covers the driver actively switching the ICE off in a hybrid, though.
Of course, many hybrids have systems to run the power steering and brakes while the engine is off.
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03-06-2015, 03:29 PM
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#9 (permalink)
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Master EcoModder
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I think that it depends on the vehicle and the situation. If the car has DFCO, then one gets some benefit from coasting in gear, or when one has to come to a stop. But, if one is coasting down a long hill, then one may get more benefit from coasting in neutral or EOC.
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03-06-2015, 03:36 PM
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#10 (permalink)
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Master EcoModder
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The laws against coasting are very ancient and hybrids were nonexistant in the 1930s when most of those laws were written.
Hybrids coast with the engine off as a basic design principle.
Anyone here read about a single citation being written much less a conviction being handed down for coasting, engine on or off?
regards
mech
Last edited by user removed; 03-06-2015 at 11:40 PM..
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