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in long highway, using cruise control save gas? since gas price is so high:drool:
 

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in long highway, using cruise control save gas? since gas price is so high:drool:
You're damn right it will. It does make a difference. I've tried all the ways there are. haha. No on gets cheaper than I do. :)
 

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i dont see how this will work where the engine still needs gas to run. your using the same amount of gas keeping your foot steady so you stay one speed. is this not true or am i missing something here?
 

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Cruise control can keep your speed much steadier for much longer than you can on your own. And it's one less thing you need to think about while you're driving. Though I have noticed that if there are a lot of hills it may not work as well because it doesn't use gravity to build up a reserve of speed on the declines.
 

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personly i like to be in controll of my so i dont use the controll but when i do if im goin up hill the engine will rev high to gain the speed back. and on a down hill it wont let off so keeping the speed steady yes would help but there are other conditions that make it worth
 

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i dont see how this will work where the engine still needs gas to run. your using the same amount of gas keeping your foot steady so you stay one speed. is this not true or am i missing something here?
you cant keep your foot as steady as cruise control does. Downhill its a different story, i use cruise control on steady ground and then turn it off up and down hills. It will down shift to keep the speed down instead of braking so it will use engine braking in a sense and eat more gas than brakes.

Personally i dont like it because it has the tendency to put you to sleep. Wasting another 10$ of gas on a trip is nothing vs totaling the car if you fall asleep.

I use cruise control when cops are around or in a cop infested zone just so i dont forget and go to pass someone and get myself a stupid ticket.
 

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you cant keep your foot as steady as cruise control does. Downhill its a different story, i use cruise control on steady ground and then turn it off up and down hills. It will down shift to keep the speed down instead of braking so it will use engine braking in a sense and eat more gas than brakes.

Personally i dont like it because it has the tendency to put you to sleep. Wasting another 10$ of gas on a trip is nothing vs totaling the car if you fall asleep.

I use cruise control when cops are around or in a cop infested zone just so i dont forget and go to pass someone and get myself a stupid ticket.
I agree with you completely. I still use it, but what I hate is when you're set at a speed, and someone is going REALLY slow and you have to brake. That on the other hand defeats the purpose of CC. That is, if you have to hit your brakes every 5 minutes for some 1,000 year old retired guy that has no where to be besides the local McDonalds for his free coffee and to b/s with all of his buddies about their putts. :banghead:
 

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I agree with you completely. I still use it, but what I hate is when you're set at a speed, and someone is going REALLY slow and you have to brake. That on the other hand defeats the purpose of CC. That is, if you have to hit your brakes every 5 minutes for some 1,000 year old retired guy that has no where to be besides the local McDonalds for his free coffee and to b/s with all of his buddies about their putts. :banghead:
lol
 

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What you are missing is the fact that the average human can't keep their foot very still for very long. For instance, get in a fight with your wife and discover you are now going 85mph. A sad song comes on the radio and now you're going 60mph. Or the cell phone rings. Or you want to switch cd's, or any of a hundred other things. The computer, on the other hand, is happy to just count away 1's and 0's to infinity, so it can keep the speed much more steady than most humans.

Jim Snover

i dont see how this will work where the engine still needs gas to run. your using the same amount of gas keeping your foot steady so you stay one speed. is this not true or am i missing something here?
 

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I use cruise control on long trips on mainly level roads. I get about 29MPG steadily most of the trip.
 

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That on the other hand defeats the purpose of CC. That is, if you have to hit your brakes every 5 minutes for some 1,000 year old retired guy that has no where to be besides the local McDonalds for his free coffee and to b/s with all of his buddies about their putts. :banghead:
That sums it up 100%.
 

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Discussion Starter #12
when downhill, it may downshift, engine RPM goes high, but PCM will cut off gas when engine RPM is higher than about 1500. so, it will not eat more gas than brake. i maybe wrong, but that is what i think

you cant keep your foot as steady as cruise control does. Downhill its a different story, i use cruise control on steady ground and then turn it off up and down hills. It will down shift to keep the speed down instead of braking so it will use engine braking in a sense and eat more gas than brakes.
Personally i dont like it because it has the tendency to put you to sleep. Wasting another 10$ of gas on a trip is nothing vs totaling the car if you fall asleep.

I use cruise control when cops are around or in a cop infested zone just so i dont forget and go to pass someone and get myself a stupid ticket.
 

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that's called decel fuel cutoff. All companies makes that part of the control strategy to save gas. You can see the effect of this if you have an OTIS or EVIC that has the instant MPG function. When you are cruising and you let off the throttle completely the MPG goes way up (i.e. not just up a little bit). I'm not sure how aggressively chrysler does this because in some instances this does not happen...

Honestly though, I wish they would implement a different type of cruise control that's constant throttle. So instead of adjusting the throttle to match the speed, it will just hold the throttle and let the car speed change with the terrane. This will give the best MPG. Although it is annoying to other drivers if the hills on the road are significant (i.e. drops your speed by >10 and makes people angry at you :))
 

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when downhill, it may downshift, engine RPM goes high, but PCM will cut off gas when engine RPM is higher than about 1500. so, it will not eat more gas than brake. i maybe wrong, but that is what i think
i think of it as it is in the case of a standard car, down shifting would consume more gas than just pressing in the clutch and slowly braking or down shifting to accommodate the climb that will soon arrive yet still avoiding the throttle.

I didnt know about the PCM so i could have it all wrong, just from the looks of it, the tranny downshifts and it doesnt feel too healthy for the tranny especially if the car is loaded with junk.

CM
 

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I drive from Syracuse to Buffalo many times a year, and that's about a 150-ish mile trip. I've found that CC makes a large difference in my fuel economy. When I do it myself, I get ~26 MPG, and when I use CC I get ~30.

Also, not even sure if the car knows what it's talking about, but it seems to think I get better gas mileage when I open my sunroof to 'Vent'. I'm guessing it would have something to do with the increased downforce. True, it might be negligible but at 73MPH maybe it amounts to something. I would think it increases drag because of the contained vortex, at least that's what I think it's called-- my roommate is an engineer and was talking about this stuff for a week this past semester.

Regardless, no matter where I'm driving, has to be highway driving though, I get 1-2 MPG better from opening it.
 

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Now that is interesting. It must be reducing the drag of the vehicle, so it is not increasing downforce. Downforce is just drag applied vertically (sort of. With a lot of qualifications, exceptions, conditions, etc, but mostly, downforce is just "lift," pushing you into the ground. And you can't get lift without drag).

The Intrpid has a slippery body. When you set the sunroof to vent it must be making the airflow remain more laminar over the roof and trunk. Very interesting.

Jim Snover

snip

Also, not even sure if the car knows what it's talking about, but it seems to think I get better gas mileage when I open my sunroof to 'Vent'. I'm guessing it would have something to do with the increased downforce. True, it might be negligible but at 73MPH maybe it amounts to something. I would think it increases drag because of the contained vortex, at least that's what I think it's called-- my roommate is an engineer and was talking about this stuff for a week this past semester.

snip
 

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...

Honestly though, I wish they would implement a different type of cruise control that's constant throttle. So instead of adjusting the throttle to match the speed, it will just hold the throttle and let the car speed change with the terrane. This will give the best MPG. Although it is annoying to other drivers if the hills on the road are significant (i.e. drops your speed by >10 and makes people angry at you :))
****'em...they are not paying for my gas, they can honk all they want, honking is still free.
 

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I drive from Syracuse to Buffalo many times a year, and that's about a 150-ish mile trip. I've found that CC makes a large different in my fuel economy. When I do it myself, I get ~26 MPG, and when I use CC I get ~30.

Also, not even sure if the car knows what it's talking about, but it seems to think I get better gas mileage when I open my sunroof to 'Vent'. I'm guessing it would have something to do with the increased downforce. True, it might be negligible but at 73MPH maybe it amounts to something. I would think it increases drag because of the contained vortex, at least that's what I think it's called-- my roommate is an engineer and was talking about this stuff for a week this past semester.

Regardless, no matter where I'm driving, has to be highway driving though, I get 1-2 MPG better from opening it.
lol thats funny, i would guess the exact opposite effect. But it all depends on your route, any slight incline or change in road conditions will influence your MPG.

CM
 

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I use cruise control when cops are around or in a cop infested zone just so i dont forget and go to pass someone and get myself a stupid ticket.
Great advice. Aside from fuel efficiency this is mostly the reason I use cruise.
Even in the city.


As for the contantly shutting it off due to the car in front. Simple, you are following too close. Slow it down a notch or stay further back.

The locking throttle idea has potential. I have a long stretch of 50km/hr zone that is a bit wavy in alltitude. I set the cruise just under 70km/hr. The cruise is not smart enough to hold the speed steady enough to hold torque convertor lock up.

About losing speed up a hill. You can either override it for such an occasion or stick to the right lane. You will not make me angry.
 

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CC will save a lot on flat terrain, because as others have said, it holds the throttle steadier than you can. I can beat it in hilly terrain, however, by holding the throttle steady and letting the speed increase on the downgrades and buff off on the hills. Just have to watch the 18 wheeler on your bumper.
 
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