I have a 2007 Chevy Cobalt Lt with the 2.2 liter Ecotec engine. I have noticed that when it starts getting cold around winter through winter my MPG drops a good amount. Last winter it went down to about 22.3 MPG. Does anyone know why it does that and is that a bad thing?

 

idk i get like 30ishmpg year round..... im running 10psi on a 50 trim, and 60lb/hr injectors? go figure.

 

i get about the same its because when the engine is colder it takes more fuel and makes it run better hense the cold air intake

 

Colder air is denser which makes your ecu add more fuel at each throttle position. More power, lower mpg. Also, gas mixtures change in the winter which gives worse mileage.

 

^^^ what he said. colder air = more oxygen = more fuel.

 

When i had my 06, it average 31 in the summer and 28 in the winter.

is 22 your average? cause that seems very low.

 

He could do mostly city driving though. It really depends on your mix of driving. On the highway, my car is good for about 40mpg. Throw in the city driving and its down to around 33-34mpg.

 

As other have said, it's cuz it's cold out. So far mines getting 36.6MPG Supercharged on 60lb injectors woot!

 

i get 26mpg average. mostly city mileage though.

 

that's me right there

 

I had my oil change, transmission fluid change, new air filter and fuel filter done after 33k miles and watched my MPG climb, climb and climb.

When I first got the car I could only get up to 31.1mpg average max.

After that it dropped to around 29 for a long time.

The little 2.2 got up to 32.8 mpg, then I filled up with some Circle K gas in an emergency and it shot down.

I refilled with Shell 87 once again, and it climbed back to 32mpg, but is lingering there and does not seem to want to climb and climb like it did.

If they did not go to the winter fuel mix, I know my average would have at least been 33mpg.

I had the wife's Ecotec 2.2 Sunfire on CC at 70mph driving to Vegas and it landed a little over 37mpg. Usually she got 29mpg, and I know it is because she needs new O2 sensors. She has 110k miles on the original sensors. I am hoping this pay I can afford to have new ones installed. I know the MPG with all the mods she has will go up to at least 35mpg average and 39mpg all freeway. If I get the 4:2:1 header and downpipe installed, it will go up even more. I am going off of all the others here and on the J forum about their jump in fuel efficiency after header install. Some claimed a 5mpg jump, I am skeptical. I would say maybe 1 or 2 mpg more if the driving habits stay the same.

I also wanted to say, my brother's LT Sedan was at 26mpg and I confronted him recently about this. He kept getting the cheap gas at Circle K and a member here pointed out to me that it is why my MPG went down due to the ethanol they use in the cheap gas.

It is not much less $ wise to get Shell, and the difference in mpg is drastic.

In fact, 2 days after he filled up with Shell 87 octane, he was up to 26.6mpg.

I know that a week from now he should be up there around 29mpg if he keeps using Shell.
I am also going to get him some fuel injector cleaner, Earnhardts has worked way better than all the brand I have used.

I have also thought highly of the Z Max, but it only works if your fuel system is really crudded up. It just gets you back to clean, and using it every 3000 miles is useless. Once every 30k miles perhaps, but not 3000 miles.

I used Z Max on my little Geo Storm and it had a big jump in mpg, but understand, the car was old. Someone using this in a new car is not going to clean much out as there is not much build up there anyways. That is why Z Max had a lawsuit against them, they falsly said they can increase everyones mpg, and it simply is not true. Same as trying to Seafoam an engine with 5k miles on it, useless.

 

29.7MPG city/hwy.

 

21mpg alllll city.

 

Mostly city driving i average at about 32mpg, i drove on the hyw one time this summer and i topped out average at almost 40.

 

I get 21 everywhere I go but i aint stock

 

i get 31hwy/28city on average...but im supercgarded so my gas mileage is a lot less than stock...

 

Lay off the throttle and you'll be better then stock. I supercharged mine and gained 4mpg.

 

I have the same car and mine never changes

 

i run shell 93 al the time except for emergencies and i get 26-29 city(i dont baby it in the slightest) and usually 36-40 on the freeway( again depending on how hard im driving it) at about 70mph

 

Well I called the dealer ship and asked and I told him that last winter and for the most part this winter i only drive like at most 10 minutes at a time and he said that would cause it to get that low because its not getting up to full runing tempature.

 

4 speed auto kills the mpg

 

At the time of my last fill up I had hit 41.2mpg with a 2.2L ecotec in a 07 chevy cobalt.

 

At the time of my last fill up I had hit 41.2mpg with a 2.2L ecotec in a 07 chevy cobalt.
technically 5.7L/100km

 

I get between 10.6L per 100kms (22 mpg) and 8.8L per 100kms (26 mpg)