Is it bad to coast in neutral....

[bentjazz]

While on the highway, I coast while driving towards the off ramp when I go to the gym. it's all down hill and my Ecometer has hit as high as 329mpg. I do it to amuse myself and to save gas, but I was wondering if it's bad for the tranny to coast in neutral?
Thanks.

[WeeYari]

No it is not bad for the tranny. If you really want to have fun with the ecometer, try coasting while in gear. If you can hold the engine to above 1100rpm (I think that is the number) without pressing on the gas petal, DFCO kicks in and no fuel is being used. Once engine idle drops below 1100, fuel is being fed to the engine.

[1.5]

Beat us all to it lol ^

OP- there is a sticky on this

http://www.yarisworld.com/forums/showthread.php?t=4248

[jayeh]

Originally Posted by bentjazz

While on the highway, I coast while driving towards the off ramp when I go to the gym. it's all down hill and my Ecometer has hit as high as 329mpg. I do it to amuse myself and to save gas, but I was wondering if it's bad for the tranny to coast in neutral?
Thanks.

Well, if you coast in gear you aren't using an fuel but in neutral you are using fuel to run the engine. The difference is marginal.

You're also putting additional wear on the brakes too since you are losing any compression braking effect.

But its your car so go nuts!

[ilikerice]

OH GEZUS, NOT THIS THREAD AGAIN!

NOOOOOO

[bentjazz]

Thanks, guys. I hit 349mpg this morning. Oh yeah....

[why?]

Originally Posted by jayeh

Well, if you coast in gear you aren't using an fuel but in neutral you are using fuel to run the engine. The difference is marginal.

You're also putting additional wear on the brakes too since you are losing any compression braking effect.

But its your car so go nuts!

what you wrote is wrong. Please read more on the fe forums, the information to correct you is all there. Thank You.

[jayeh]

Originally Posted by why?

what you wrote is wrong. Please read more on the fe forums, the information to correct you is all there. Thank You.

Huh?

Even the sticky thread in the FE forum says to leave it in gear?

[Sparcoboy]

Originally Posted by jayeh

Huh?

Even the sticky thread in the FE forum says to leave it in gear?

You are correct, why? is wrong :D

[brg88tx]

last standard i had was a 4 cylinder nissan frontier truck and i used to coast in neutral a lot. i had to replace the throwout bearing at just over 100,000 miles and i always wondered if it was due to coasting in neutral.

[Sparcoboy]

What does a throwout bearing have to do with coasting in neutral?
It only wears when your pushing the clutch pedal.

[why?]

Originally Posted by Sparcoboy

You are correct, why? is wrong :D

here we go again. There are only two instances where leaving the car in gear will get you better gas mileage, if you are going down a steep enough hill that the car keeps the acceleration anyways, or if you are slowing down to a stop anyways. On a flat road leaving the car in gear will get worse mileage than putting it in neutral will, because you will have to hit the gas pedal more with the engine sucking the energy out of your forward momentum.

In reality a combination of both is the best to get the best gas mileage, depending on the situation you are in and the traffic, etc.

[Sparcoboy]

Coasting will never save you gas if you don't intend to stop or at least slow down. The best way to get from a to b is at a constant speed. Just coasting and then accelerate to your previous speed is useless

[why?]

Originally Posted by Sparcoboy

Coasting will never save you gas if you don't intend to stop or at least slow down. The best way to get from a to b is at a constant speed. Just coasting and then accelerate to your previous speed is useless

This is totally false, as countless thousands of hyper milers have proven beyond a shadow of a doubt.

[nopk]

Originally Posted by why?

There are only two instances where leaving the car in gear will get you better gas mileage, if you are going down a steep enough hill that the car keeps the acceleration anyways, or if you are slowing down to a stop anyways.

this is a pretty narrow minded way to look at this, and may encourage people to look at this the wrong way

let me re-word what you're saying:

always leave the car in the most optimal gear, except for when you're just about to go below 1000PRPM in first and stop.

doing this, will ensure you will have the best MPG possible, as being in neutral never helps your MPG

[daf62757]

I am not questioning the DFCO issue but while I was on a long downhill glide, the gas gas dropped a level. I was in Drive and my foot of the gas pedal, so if it doesn't use any gas, why did the gas level drop? Couldn't have been the angle of the road or car on the road because that was a constant. There has to be some gas being used for the gauge to register a drop in fuel.

[Sparcoboy]

because your gas tank ain't level no more the sensor may measure a lower level.

[nopk]

Originally Posted by daf62757

I am not questioning the DFCO issue but while I was on a long downhill glide, the gas gas dropped a level. I was in Drive and my foot of the gas pedal, so if it doesn't use any gas, why did the gas level drop? Couldn't have been the angle of the road or car on the road because that was a constant. There has to be some gas being used for the gauge to register a drop in fuel.

i wouldn't take that to be accurate, for a whole slew of reasons. mostly, among which, that it isn't super accurate in terms of time. so, i wouldn't consider that