BlueThunder2006

I have an '06 2.2 and my GF has an '07. Both automatics, 2 door, etc. The weird thing is, her car (even with me driving it) constantly gets better mileage than mine... I'm talking a good 4-5 MPG difference here. Granted, she's VERY easy on her car, rarely running it above 3K on the tach. But even with driving mine the same way, I cannot get the mileage she does. I can't seem to break 26 MPG in mine, driving the same roads, etc. I'm wondering if something changed from '06 to '07, like final-drive ratios or some such. I've got a brand-new air filter and just had my oil changed... I'm beginning to think I've got a clogged catalytic converter. Any ideas?

tonio5555

I drive my 06 decently hard with a 50/50 mix of highway and city driving and I'm right around 26mpg. I also have intake/exhaust which helps.

Moza13-

07's have different a valve cover like the 2.4's , same exhaust manifold as the LSJ, and im not sure what else but there are quite a few differences. we also have a different ECU

YSUsteven

Maybe it has a different computer program loaded. I had my computer updated, and I lost power under 2000 RPM which should give me better gas milage. This program was supposed to be released a couple months ago.

Maybe you two just need to learn to drive better. I get 24 MPG on the daily terk of 13 miles, ALL city traffic. I don't race from light to light. I have no performance mods to my car, yet....

BlueThunder2006

Hmmm... I hadn't thought of that. I'm thinking it's a cross between driving habits and some differences with the cars themselves. I know I drive slightly "harder" than she does, but I don't "beat" the car by any means. Even if I drive both cars exactly the same, hers gets better mileage. Kind of frustrating, considering that she gloats about it all the time.

YSUsteven

I think the 2006 2.2 has the D shaped manifold at the O2 sensor, and the 07 has same as the 2.0, might account for maybe 1 mpg

Novajoe

all your guys' cars are screwed. I rod the **** out of my auto 06 and still manage at least 29mpg. back country roads are fun

PinkStripedCobalt

^^^i agree i have been getting 29 MPG as well, highway its amazing, its like the balt is on steriods i drove all the way to KC a few weeks ago and i was getting an average of 38 MPG on the highway doing 80 all the way i stopped three times for gas and i wasn't even near being empty when i stopped, with a few stops in traffic for construction!!!!

brianm01

07's have better ignition, better flowing heads, at least on the exhaust side which could probably result in better fuel milage in the newer vehicle

06_ion2

reset the fuel trim dash hawk ftw

409Cobalt07

i have owned a couple of 2.2s already. and 05 and now i have an 07. and the worst i got out of the 05 was like 28mpg. the worst ive gotten out of the 07 is somwhere around the same. honestly i really havent seen any difference in the gas milage between the 2 cars. i am getin around 35 with the new one and got the same out of the 05. i dont know why you guys are gettin such horrible gas milage.....

dennis3553

i got an 06 2.4 i cant break 24.6 iv only had it for 3 weeks it was at 19 when i got it

Archie

Well that's your problem. These engines only get their best gas mileage after about 5,000 miles.

And you know that you can reset the idc?

mlcroy20

I have an 05 and driving around Orlando all day I get about 28mpg if I get out on the highway it's around 36 - 40 depending on how fast I run it. I think the lowest I've ever got was right before I changed my oil and changed my air filter to a K&N it had dropped down to about 25 - 26. I had an 07 rental cobalt that I ran the **** out of for 2 weeks in PA and it never dropped below 30 so I'm sure it is a little bit better than the 05/06...

joeworkstoohard

hmmm... I wouldn't mind a few more mpg. you 2.2 guys have it made... regular fuel AND more mileage.

but then again... mine can get out of its own way...

monkeiboy

Your car's ECU will also "learn" your driving style. If you make alot of slow starts and easy accelerations, your car will start conserving fuel for you. IF you constantly haul ass from point A to B, your car will dump fuel in every time you mudge your gas pedal.

Novajoe

any balt can get out of it's own way... it's not like we're driving gremlins...

and if you change it up on it then it goes OMGWTF, sprouts a big turbo and beats ls1s all over the nation

Archie

Yeah, mine did something like that. It was weird, I had been driving my car with the pedal to the floor for over 7999 miles, and as soon as it hit 8K, my hood split open in the middle, and a giant 6-71 Blower grew out of the engine!!! It was sweet!! I took it to the track that night, and ran a 11.85 at 126mph!! Wheelspin like a ****. Then I let my dad drive it the next morning, and he drives like a little old grandma that can't see over the steering wheel, and the blower disappeared. I would love to show you guys proof, but I forgot to take my video camera, and I accidentally left the time slips in my pants when I washed em.

All that work for nothing!! Now I unplugged the battery again, and it looks like I gotta do another 8K miles with the pedal floored to get that blower back.

Just kidding, I would never let my dad drive my cobalt.

monkeiboy

what the hell are you on about?

Novajoe

I dunno... too much coffee