Winter Mpg Thread!

[Annihilator]

Hi guys, I recently took a trip with my '00 Z71 and only got 14mpg 100% all highway. It was rather cold, below freezing but still.. It has new NGK platinum plugs, delco wires, delco o2 sensors, and runs great. I was driving near 70mph the entire time. I was thinking about buying one of those grille bra's to keep it a bit warmer.

How are you guys doing on mpg?

[FargoZ71]

8-9mpgs.. in all around, but it was -25 fehrenhight last week, on the hwl I managed 13mpgs. Im just wondering how much my fouled O2 sensor is killing it.

[Daryl Z71]

Hi guys, I recently took a trip with my '00 Z71 and only got 14mpg 100% all highway. It was rather cold, below freezing but still.. It has new NGK platinum plugs, delco wires, delco o2 sensors, and runs great. I was driving near 70mph the entire time. I was thinking about buying one of those grille bra's to keep it a bit warmer.

How are you guys doing on mpg?

 

 

 

 

What temp was the truck running at? If its to low it might need a new thermostat because running it cold will cause it to run rich. Its also partly due to the winter gas mixture im told. I know even my trucks average mileage has gone down, but not by much. was 16.8 now its 16.6

[mhenshaw]

Wrong section this was dicussed a week ago.

 

Hows That Winter Gas

[Annihilator]

Truck was around 200 degrees so operating temperature. I used to get 18-19 in the summer..... I'm curious if the plugs have something to do with it. They are oem type NGK plats... Also, I need a new intake gasket as mine idles rough until it warms up.

[RyanbabZ71]

moved to the correct forum.

[Ryan00TJ]

75% Highway 25% City E10, WV Hills. 14-15MPG Same routine in summer weather achieves 18-19MPG.

[Bull-Dogg]

I've been getting Horrible Mileage with 04 Silverado this past month.

[zibzer]

You're not alone. My mileage has always been considerably worse in the winter.

[Silveradoman78]

i get worse in the winter too i think cause the truck starts at higher idle when cold rpms are high till temp guage get over 1/4 and such

[becker87]

8-9mpgs.. in all around, but it was -25 fehrenhight last week, on the hwl I managed 13mpgs. Im just wondering how much my fouled O2 sensor is killing it.

 

 

Don't you just love ND!!

[kawtoy_77]

I know the 4spd tranny in my gmt900 doesn't shift to overdrive until it hits 72 degrees internally. It takes quite a bit longer to hit 72 degrees, when you start off at 9 degrees..... So I know I am running more rpms for at least 4-6 miles

[txab]

During cold weather your engine is operating in open loop longer, which can cause an increase in fuel usage

[lhr360]

Hey guys I live in South Dakota and notice a difference in mileage. I drive 80 and during the summer can average 17-19 and during the winter it is 13-16 even my in town mileage is down with the colder weather. But I do not think it has much to do with the engine temp. I think it is that the drive train is exposed to the cold weather and never gets warmed up when it is 0 degrees out and this makes it harder for the engine to move these components causing your fuel mileage to be worse. I suppose using a synthetic fluid in everything would help

[cghbuilder86]

My mileage is also a lot worse in the winter. But it's not the gas, because some days the sun will come out and it will warm up a good bit and my mileage instantly starts improving. It's just the cold for some reason.