Just a quick question- Before my 09 SS/TC I had a manual '95 Jetta, when going down decent sized hills I could throw it in neutral and pick up speed, when I try the same in my Cobalt, I slow down.

Why is this?

 

I don't notice this in my cobalt ... you could attribute it to larger and wider tires creating more resistance against the wheel's velocity, wind speed, etc.

I've owned a Mustang GT, Civic Si (both manuals) and this car picks up speed when coasting down hill as they had.

 

Why do you want to do this?

 

It's because Jetta's like going down, much like their drivers.

 

I'm not sure about where you are but thats illegal in my state. Think if a car pulled out and you needed to hit the gas to swerve around them.

 

Wait what? If a car pulls out in front of you, you should probably be slowing down, not speeding up...

 

its more benefitial to have the car in gear and be in vacuum than it is to be coasting in neutral

 

Not if your too close you might have to go around them. There's plenty situations where being in neutral could cause you to have an accident.

 

leave it in gear. jeez when will people learn? you get better gas mileage by leaving it in gear.

 

Oh God, not this argument again...

 

LOL!!

 

This has been beaten worse than the OPs mom.

When you leave it in gear about 35mph or 3500 RPMs the car isn't using any gas.

Why you put it in neutral it adds fuel to keep from dying.

Leave it in gear when coasting

 

but why is it when i leave it in gear it shows 75instant mpg and in neutral it shows 99?

 

Mine says quite the opposite. I watched the LTFT and STFT. Those both drop to 0 when coasted at high RPM or speed. That means the computer isn't adding fuel which is what you want. Now when the car is idling it is always adding fuel. This has been tested over and over.

 

I hate you.

 

You have to be in the right mph/rpm range for the fuel cutoff to occur. Try it in 5th coasting down from 75.

 

Yep, like I said, It has to be above 3500RPMs or 35mph with it in gear.

 

uhh your e brake is stuck buddy

Ummm , braking with your clutch can cause problems with the firction plates and cause your clutch to heat up if you use it a lot for engine braking .

 

A coast down at 3500 RPMs or less is fine. It won't hurt your clutch if you don't coast down from 6k or something crazy.

 

i rofled when I read this.

actually i rofl at the whole thread.

 

First of all, look- I never asked anything about mileage- I understand the concept behind turbo chargers and that vaccuum aids in gas mileage. I was only wondering if there was a simple explanation behind the fact that I lose momentum when coasting down hills, I don't do it to save gas, I just tried it once and noticed it.

Also, I know the first thing I think when something or someone unexpectedly pulls out in from of me is, 'welp, i better pound the accelerator and swerve to miss this guy' Absolutely retarted.


my mom died 3 weeks ago from breast cancer, thanks queef ass

 

agree. It is a dead topic. Just do as you please. it's your car.

The difference in gas isn't much. But if you put it in neutral you are taking away control of car and using more brakes. If you coast in gear you are hurting the clutch a little more.

Pick your poison.

 

Who cares about gas milage , if my car slowed going down hill i would want to know why. There has to be something causing the resistance . A simple question gets turned into an argument in here , people need to shut the **** up if they don't have anything to add except trying to look like an E-thug.

 

Someone said it before. Wider stickier tires attribute to more rolling resistance, in addition to other aerodynamics that keep the car glued to the road, depending on your speed. That being said, IMHO, I never coast down a hill in neutral. No need to badmouth the guy. I'm sure he realizes what he's doing. He's just asking for WHY it happens, not why he shouldn't do it.

 

Absolutely. My Gawd there's alot of nippleheads on this forum.