Does non-moving A/T car consume more fuel if...

**ghosthunter** · September 21st, 2007 11:30 AM

Does a non-moving A/T car consume more fuel if the shifter is in D or N ??

Imagine the situation is you are waiting for the traffic light to change from red to green.

**alwayz_yummy** · September 21st, 2007 11:38 AM

D consumes more kasi engaged ang tranny and braking it counter-acts the action of the tranny--kaya nga bumabagsak yung idle speed ng engine...

N- is just in neutral--free moving ang a/t...

eto pagkakaintindi ko..

**ess** · September 21st, 2007 11:41 AM

How about for short stops (e.g. less than 1 minute)?
Will transitioning from D-to-N then N-to-D for short stops consume more fuel than just sticking to D?

**redorange** · September 21st, 2007 12:43 PM

Whatever fuel you conserve won't be worth the cost of a new tranny caused by the wear and tear you cause from shifting back and forth for short stops. The rpm variation between D and N is really negligible to matter, you'd save more fuel by driving smart.

**alwayz_yummy** · September 21st, 2007 12:52 PM

kung madali lang ang traffic light, say less than 30 secs--leave to d lang..pero kung jam na iba na usapan yan...

ang mahirap is ung filipino-traffic situation called: tutukan--where in ayaw mo pasingit sa mga pilit na sumisingit..

**XTO** · September 21st, 2007 12:56 PM

D is my vote. not only gas consumption but also brakes and battery.

**ptk675** · September 21st, 2007 01:09 PM

kung quick stops lang, say a minute or less, ok lang iwan sa D. Pero kung matagal na stops, i think its better to put it in P.

Not sure how true it is but I read somewhere that leaving an AT tranny in the N position for extended periods will starve the tranny of ATF.

**ronw123w124** · September 21st, 2007 01:44 PM

I would be more concerned about the stress you put on a transmission by leaving it in "D" position in a traffic jam, because it is engaged in "D" and it is suppose to be moving, IMO, it is better to shift to "N" when the car is in standby mode.

**1D4LV** · September 21st, 2007 01:53 PM

Originally Posted by ronw123w124

I would be more concerned about the stress you put on a transmission by leaving it in "D" position in a traffic jam, because it is engaged in "D" and it is suppose to be moving, IMO, it is better to shift to "N" when the car is in standby mode.

+1 here. even though the stops are quite low like let's say, 30 seconds, it is still moving, so the load is on the transmission as well as on the brakes.

it is better if even in short stops, that you put it in neutral. you save gas, you save your brakes, you save your transmission. and besides, i think modern AT assemblies are very durable to do that.all it takes is one click of your hand.

**Lucius** · September 22nd, 2007 01:33 AM

Originally Posted by happy_gilmore

+1 here. even though the stops are quite low like let's say, 30 seconds, it is still moving, so the load is on the transmission as well as on the brakes.

it is better if even in short stops, that you put it in neutral. you save gas, you save your brakes, you save your transmission. and besides, i think modern AT assemblies are very durable to do that.all it takes is one click of your hand.

Good one. On my mazda3, when I keep it on D then i pull up the hand brakes, it advances pa din. Mas ok kung naka N na lang, ganun din naman. Unless gusto mo ng full throttle launch