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I have a 2005 Chevy Colorado z71 crew cab. Ive been getting averagely 11 miles a gallon. Just cleaned throttle body. Put new plugs in and a k&n air filter. Dumped some fuel injector cleaner in too. Still getting around the same gas mileage. And yes my tire pressure is correct and everything on the truck is stock. Please help!
 

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Youngen!
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Welcome to winter gas and winter mpg. Your from pa I see so am I.

In the spring/summer I can get 100 miles per 1/4 so around 23-25

All winter I'm getting 70 per 1/4 if that. It's cold as shit trucks eat gas. I'm getting 15-17 now.


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Ya I understand that and I've been told by a few people it could be just that. But don't u think 11 mpg is a sign something else is wrong. And by the way I just bought this truck 3 months ago so its my first winter with it
 

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Youngen!
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Nope it's the area/gas and how cold it's been. When it's 20* out or 2* out I can watch my gas needle honestly drop. Just wait till spring and I'll get better. Get a tune and ull be happy.

Where in pa are you?


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I'm from pa as well. City driving plus winter temps/gas equals shitty mpg. If you're driving highway though that is low. If you're driving city in 4x4 with all this snow/cold then 11 is about right. I got 19 on the highway though over the weekend through 2 tanks of gas on a 600+ mile trip. That's the best I've seen all winter. Summer though I'd have got 22 probably.
 

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Youngen!
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Yeah that's another city/hwy.

I used to drive 70 miles round trip on 60% interstate So I could get 25+ normally.

Now I doing 100% city driving and it's just killing my mpg.


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Cool. It seems that most of these threads are guessed based on needle position and how much gas they think they used.


You said the truck is stock. I assume that means tires are stock diameter too (and confirmed stock size based on the manufacturer sticker).

Did the mileage suddenly drop, or was it a slow progression over a period of time.

I get less than 16 with my Z85 PCM. I do have over sized tires though, so my bad mileage is self-induced.
 

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Discussion Starter #12
I just bought the truck around Thanksgiving and noticed it basically right away and that's why I changed my plugs, which were completely fouled, and put a new k&n air filter in. Also cleaned the throttle body. And nothing has changed with mpg
 

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How many miles are on the truck? Better would change both O2 sensors if it's over 100k. These regulate how much fuel is sent to the engine.
 

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I get about 200 miles per tank on my trailblazer between cold weather, winter gas and all local traffic driving.
 

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I average 10 - 13mpg (based on my UltraGauge), but I do mostly in town, short trips. On the weeks where I do a lot of highway driving my mileage shoots up to 25 - 26mpg!

I tend to be a lead-foot . . . I've found my in town mileage improves quite a bit if I keep the RPMs under 2k, but I have a hard time doing that :D Truck is 100% stock as far as I can tell. I plan on getting a tune at some point in the future.
 

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one problem I found is that the 02 sensors don't get hot enough to signal properly in the cold (-25 and colder), wrapping the exhaust pipe/cat in heat resistant insulation seemed to help a bit.

also full synthetic motor/tyrany/gear oil help cold weather mileage considerably. I've seen both trany an motor oil gel up like Vaseline, and regular 80/90 weight gear oil at -40 has consistency simular to roofing tar. its just extra work for the motor to push


Ive seen motors seize in big diesel trucks because the oil pan heater quit, oil got so thick it wouldn't pump, and the driver didn't notice the big red stop engine light, or that it had 0 oil pressure.
 
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