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

**josechoyjose** · November 24th, 2007 03:43 PM

Linalagay ko lang sa N kapag matindi talaga ang trapik. Kapag moving tulad ng sa EDSA ay D ako palagi. Preno-preno lang. Hindi ko naman namamalayan kung ano ang mas malakas sa gasolina. Ang importante ay komportable ako magmaneho.

**jpatricks1** · November 24th, 2007 06:14 PM

I'm no expert so do correct me if I'm wrong, but I think it's the same given that your idling would be the same whether in N or D (while stationary of course).

OT: I wouldn't reccomend putting it in P while traffic. If someone bumps you it might ruin your transmission. Put it in N + parking brake

**tanoshi_637** · November 28th, 2007 01:00 AM

IMHO better to shift AT to N during long stops, take consideration sa AirCon mo it takes load from engine tapos dadag dagan mo pa ng load sa pag pigil sa engine pag stop at D. Possibly same ang RPM mo kasi automatic na nag aadjust ito.

Extra Question:
for Automatic Transmissions,
ok lang ba na during cruising tapos nakita mo ahead nag red ang stop light e mag slow down ka (level road, not down hill) by shifting to N + brake hangang sa makarating ka sa stop light for full stop? is this good or bad sa tranny? lets say cruising at 150kph you deaccelerate at N for about 200 - 300 meters? then if ever the light turns green before reaching the lights i rev up the engine to 2,500 then shift to D.

**_Qwerty_** · November 28th, 2007 01:14 AM

^bakit nag N ka pa? para saan yun?? does that save you gas by doing that?? i just stay in D then half break.. then kung biglang nag green.. eh di diretso lang.

**tanoshi_637** · November 28th, 2007 01:39 AM

Originally Posted by _Qwerty_

^bakit nag N ka pa? para saan yun?? does that save you gas by doing that?? i just stay in D then half break.. then kung biglang nag green.. eh di diretso lang.

Intention: para makatipid sa gas.
deaccelerating at D my RPM is around 4,500, shifting to N, drops to 1,000 all the way for about 200 to 300. I dunno if this is healthy, i need enlightenment

**tanoshi_637** · November 28th, 2007 02:02 AM

got my answer in this forum http://tsikot.yehey.com/forums/showt...?t=9482&page=6 sorry off topic na ko...

**Lucius** · November 28th, 2007 02:10 AM

Guys pano kaya sa mazda3?

**squala** · December 1st, 2007 11:41 PM

Really good points from some of you. It's really best to shift to N if on a full stop and anticipating the green after a few minutes. It's safer, and as for fuel consumption, logically it's less in N. When in D and you're stepping on the brake, the car is raring to move and a force is stopping it from doing so. These act against each other and will certainly require some energy, which is gasoline.

However, it's not recommended to shift to N and let the car roll freely before stopping at the red light. Yes, it does save some fuel, but generally less safe as well. There's nothing but the brakes that will stop the car. If you stay in D, there's still some engine braking assisting in stopping. There's also a topic somewhere here discussing the fact that N in automatics is not exactly the same as N in manuals when it comes to rolling.

**ooba99** · December 3rd, 2007 06:09 AM

Originally Posted by squala

There's also a topic somewhere here discussing the fact that N in automatics is not exactly the same as N in manuals when it comes to rolling.

Hello sir squala, I would appreciate it very much if you can provide the link that discusses this, kung makita mo lang uli. Presently, I am of belief that they are the same so that I sometimes coast on N in my a/t vehicles with the thought that it may save me some fuel. Thanks.

**Jun aka Pekto** · December 3rd, 2007 10:31 AM

Originally Posted by corbon44

errr...just to add to the options - does anyone shoft to "park" (P) while in traffic and the engine is running? what happens here and what implications does this have to the drivetrain?

That's what I do if the traffic doesn't move for a long time. Sometimes, I'll even turn off the ignition.

I've replaced brakepads (2 at a time) on our 1995 Ford Contour every ~4-5 years. But, I haven't had repairs or replacements yet for the A/T tranny since I bought the thing in 1994. it's been mostly ATF replacement. I've also driven the car aggressively for much of its lifetime. So, it's durability is quite surprising (for a Ford tranny).

Compare that to replacing the clutch every ~5 years for a Nissan Pulsar and Plymouth Laser. Brakepad replacement was about the same interval.

The 1997 Dodge Grand Caravan did have major A/T tranny repairs in 2004 and ended up with a replacement tranny. But, I think it was mostly due to extended long-distance driving rather than stop and go traffic. Our extended warranty covered it. So we didn't have to spend a single cent.

Add: As for N.... It's only use in my book is when the car's being towed.