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Save gas - car in neutral?

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Save gas - car in neutral?

Postby bruin » Thu 16 Feb 2006, 18:39:11

Here's a question:

When at a long stop light, does it save gas to put the car in neutral if you are driving with an automatic trasmission?


We've all thought about stopping the engine and then starting it again, but I've got to think that will add a lot of wear and tear on the engine. But I thought a much simpler thing would be to just put it in neutral.

As you know, automatic cars will creep forward when in drive and there is now gas, so you have to sit on the brake to keep the car still. However, if it is in neutral, the car will not creep forward. There has to be some wasted energy there.
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Re: Save gas - car in neutral?

Postby GoIllini » Thu 16 Feb 2006, 22:11:40

$this->bbcode_second_pass_quote('bruin', 'H')ere's a question:

When at a long stop light, does it save gas to put the car in neutral if you are driving with an automatic trasmission?

I've kinda thought about this, and I'm guessing it depends on your car. Keeping your car in drive actually usually keeps your RPM down a little, but I wonder if we use up more gas on each revolution.


$this->bbcode_second_pass_quote('', 'W')e've all thought about stopping the engine and then starting it again, but I've got to think that will add a lot of wear and tear on the engine. But I thought a much simpler thing would be to just put it in neutral.

Now, turning off your engine when you're waiting for a freight train to pass actually does save gas and energy while you're waiting those three or four minutes. If we have any mechanical engineers here, they can speculate on how it'll affect our car. My initial thinking is that it would probably have a negligible effect on the engine, but maybe cause some wear on the battery.

$this->bbcode_second_pass_quote('', 'A')s you know, automatic cars will creep forward when in drive and there is now gas, so you have to sit on the brake to keep the car still. However, if it is in neutral, the car will not creep forward. There has to be some wasted energy there.

True, but when you put your foot on the brake, the engine usually slows down (if it doesn't, it may be better to put it into neutral). One could make the argument that the energy for moving the car forward is no longer getting used.
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Re: Save gas - car in neutral?

Postby strider3700 » Thu 16 Feb 2006, 22:28:32

the energy is still used when you're in drive and on the brake. It's just turning to heat in the transmission.

I have my doubts that neutral would affect gas mileage much if at all. Shifting into to neutral and coasting slowly to a stop rather then being on the gas then hard on the brakes does help a bit though.

turning off the engine really depends a lot on the engine. Damage on start up comes from oil being more in the pan then in the engine. It probably won't hurt from that standpoint. It would be harder on the starter and battery then anything else. It is however illegal so I can't say it's worth it.
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