What cold weather milage are you seeing out there?

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Blueinterceptor

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Check your tire pressure. Frigid temps lower your tire pressure
 
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jamoody

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I've attributed at least part of my 2017 Yukon MPG reduction to the engine preferring to stay in 8-cyl mode (vs dropping to 4-cyl) until the engine comes up to operating temperature which takes a lot longer in these frigid temps than over the summer. Over the summer I was dropping into 4-cyl mode after 3-4 miles, over the winter it's been taking 10-12 miles (most of my 45 MPH commute).
 

Mr CFP

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I’m averaging 15.7 on 250 mile trip to Cleveland. Temps were in the low 20’s and snowing. Not sure what normal would be, just got our Denali 12/29
 

Kpwweb

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It's like a light switch. Above 50 and I get 17-17.5mpg around town. 20F and below and I get 13-14mpg around town doing the same driving. Tire pressures are 35 at 20, 37 at 50...

I think a lot of people have stated it here: colder air is denser=more fuel per unit; longer warm up times; more V8 mode; lower tire pressures; different fuel; etc... All conspire for lower mpg, I'm just surprised by how much lower!

Wonder if GM has progamming to run rich in cold weather for faster warmup (or any warmup)? I know mine with all the auxiliary coolers (trailer tow package) takes a long time to warmup in cold weather.
 

iamdub

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Wonder if GM has progamming to run rich in cold weather for faster warmup (or any warmup)? I know mine with all the auxiliary coolers (trailer tow package) takes a long time to warmup in cold weather.

Yes, they do have such programming. Higher idle and rich mixture until the coolant reaches a certain temp.
 

sickk23

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Just went from New Mexico to Alabama and back. Averaged about 19MPG with my burb FULL. 4 adults, 2 kids and a lot of luggage. I have a heavy foot too being 25 and living by the motto if you ain’t first yur last. I’m impressed with the mileage. My DIC said something like 21.1, it’s a liar haha
 

aschevfan

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Winter blend fuel sucks! The charge you more for putting oxygen in your fuel!
 

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