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Chevrolet Cobalt Real World MPG

295 messages,  Last post on Nov 23, 2009 at 4:23 PM

You are in the Chevrolet Cobalt Forum. Your Hosts are pat & karens

What is this discussion about? Chevrolet Cobalt, Fuel Efficiency (MPG), Coupe, Sedan


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#180 of 295
Re: 33.7 MPG on trip to Illinois [horsey55] by okko1
Sep 07, 2008 (6:01 am)
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Replying to: horsey55 (Sep 06, 2008 7:29 am)

you might consider a fuel conditioner. ethanol doesn't lubricate as well as gas.
#181 of 295
Mobil 1 by gtodave
Sep 07, 2008 (12:51 pm)
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i think i will try to find some of this for my oil changes from now on. it's supposed to be good for 15,000 miles.
Mobil 1
#182 of 295
28.9 MPG this time by tsjay
Sep 19, 2008 (7:23 am)
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The actual mileage calculated out to 28.9 MPG, and the DIC was showing 29.0 MPG.
 
My usual driving mix. I'm pretty happy with that mileage.
 
The car has a little over 4400 miles on it now, so it is probably still not quite broken-in.
 
I think I will go with just a regular oil change at the dealership at 5000 miles, and then I might go to Mobil 1 5W-30 full synthetic at 10,000 miles. With 4400 miles on the car, the DIC says I still have 62% of my oil life left. If I went by the DIC for the oil change interval, I would be going over 11,000 miles before changing. No way I would wait that long, not even if I were using synthetic oil.
 
Tom
#183 of 295
Re: 28.9 MPG this time [tsjay] by okko1
Sep 20, 2008 (8:00 am)
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Replying to: tsjay (Sep 19, 2008 7:23 am)

if the dealership provides the mobil 1 it will cost you about 9.00 bucks a court
#184 of 295
Re: 28.9 MPG this time [okko1] by tsjay
Sep 20, 2008 (8:46 am)
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Replying to: okko1 (Sep 20, 2008 8:00 am)

My dealership changes the oil and filter for $10 when you bring your own oil and your own filter.
 
Tom
#185 of 295
Why is my MPG decreasing? by tokyo_goddess
Sep 19, 2008 (11:55 am)
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Ok so my mom got me the cobalt in the summer of 05. I love it to pieces. But lately ive noticed that the computer dash says my mpg is really really low. Right now it says 19.6 MPG. When i first bought the car and filled up the tank it said i could go 250 miles w/o gas, now it says 200 or 210. Any other solutions as to why?
 
I took it to firestone, they suggested new sparkplugs. Which i got and didnt necessarily needs. Then they checked for a leak in the fuel line/rod. Nothing. So then i took it to the dealership and they cleaned the air filter and said that may help. Other than that no one can tell me what if anything is wrong. Is it the computer? The dealership says they found nothing wrong.
 
I'm thinking of putting a cold air intake in the car to help with the mpg issue, yeah it wont help alot, but it will help just that little bit. Help is much appreciated thanx.
#186 of 295
Re: Why is my MPG decreasing? [tokyo_goddess] by cmhj2000
Sep 20, 2008 (12:37 am)
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Replying to: tokyo_goddess (Sep 19, 2008 11:55 am)

Cold air intake will do nothing to improve mileage. Some say when they put them on it did but I've yet to see it on either a dyno, in real life or with a scan guage.
 
In my 35 years plus of pulling wrenches your solution might be as easy as running a fuel treatment solution. Many times the injectors will get dirty and that alone effects mileage.
 
Not saying the above is the issues, just the most common one I've seen if there are no codes or problems seen by your dealer.
 
Tire/wheel alignment, tire pressures, transmission fluid and I could go on and on can in time all cause fuel issues.
 
There are a slug of fuel treatments on the market. Amsoil has the best.
#187 of 295
by tokyo_goddess
Sep 20, 2008 (5:29 am)
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Replying to: cmhj2000 (Sep 20, 2008 12:37 am)

i feel like ive covered everything that may affect the mpg. The tires were changed, there was a new wheel alignment. I just think something drastic has to be affecting the mpg. Last month it was 21 mpg now its 19. somethings up...
#188 of 295
Re: [tokyo_goddess] by cmhj2000
Sep 20, 2008 (6:41 am)
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Replying to: tokyo_goddess (Sep 20, 2008 5:29 am)

Different tires can make a big difference either way.
 
Has this mileage change been a sudden issue or gradual? If gradual then my first suggestion is where I'd start.
 
Without being able to see, drive and scan your vehicle there are a lot of unknowns for me.
#189 of 295
by tokyo_goddess
Sep 20, 2008 (10:03 am)
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Replying to: cmhj2000 (Sep 20, 2008 6:41 am)

this is relatively sudden, within the past 2 months ive noticed the gas was getting smaller. But it may have been gradual for all i know >.>;

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