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How's the Cold Weather affecting your Fuel Economy?

Discussion in 'Engine & Performance' started by Jessica Smith, Jan 11, 2021.

Sponsored By: Moe's Performance
  1. Retread Tom

    Retread Tom Junior Member

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    I use my 2019 Laramie Longhorn for running around and light loads. Generally I hang in the 18-20 mpg range. Long trips I've gotten as high as 23-24. With these winter fuel blends I've dropped to 16-17 mpg. That's with the 3.21 gears.
     
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  2. Dgriffi2

    Dgriffi2 Member

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    I think I average about 13 mpg in the winter, I don’t pay close attention. I’m in upstate NY, Oswego, about 30 miles northwest of Syracuse, on Lake Ontario. We average about 150-180 inches of snow per year and so far have gotten maybe 15”? It’s all melted so most days we’re staring at dirt and gray skies. Never thought I’d miss the snow so much!
     
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  3. Doug Ram

    Doug Ram Senior Member

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    Same here. I am sick and tired of clouds and NO snow. Its booooooorrrrring.
     
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  4. farout75

    farout75 Member

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    In Missouri they change the gas in the winter months and no matter what I have drive mpg does go down slightly. On my 17 RAM bighorn 5.7 with the 3:92 gear ratio I get typically in warmer days 18 to 19.5 mpg but in the winter i's 17 to 18, and when its below 32 F it goes to 16.

    If one keeps the foot under control it sure helps. I have tried 89, 91 and 93 octane gas and it never has been worth the extra $ for the very few mpg change which has been 1 to 1.5 mpg better. 87 octane works just fine no knock, pinging at all even towing a 6,000 lb trailer.
     
  5. HEMIMANN

    HEMIMANN Senior Member Supporting Member Military

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    In my gassers I lose 2-3 mpg. Used to lose more with carbureted engines.

    Today it's a bit different in that fuel injected engines don't flood, in general (anybody remember sticking screwdrivers down carb choke plates to hold em open?), so don't waste as much uncombusted fuel. But some of that has been offset by EPA-mandated low RVP summer gas, which means summer gas is denser and yields more mpg than winter gas. Further, we didn't have farm lobby-mandated alcohol gas before, which has low BTU energy density. Gasoline has become a real witch's brew today.

    Diesel Fuel has it's own political and pollution issues. Stripped of sulfur and heavy ends in 1994, sulfur replacement lubricity additives, farm lobby-mandated soybean oil added, biocides for biodiesel storage, all contributed to much higher cost and lower energy density. At least it burns cleaner, I guess.
     
  6. HEMIMANN

    HEMIMANN Senior Member Supporting Member Military

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    Why would mileage decrease with lower engine exhaust backpressure? Not disputing your experience - it just doesn't make physics sense to me. Any insight?
     
  7. HEMIMANN

    HEMIMANN Senior Member Supporting Member Military

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    A bit off topic - how many miles on your machine? Any hemi tick sounds? We've pretty well established hemi valve lifters are sensitive to idle time, due to insufficient lubrication (hemi lifter and cam failures). Watch out for this.

    I'm formerly from Wisconsin, fyi.
     
  8. HEMIMANN

    HEMIMANN Senior Member Supporting Member Military

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    Same experience - I just changed diff & trans oils @ 36k miles and my mileage ticked up and gear noise went down. I don't know what they put in these during factory fill, but now I'm suspecting the diffs don't have synthetic gear oil.

    I put Mobil Delvac 1 75W-90 gear oil in my AAM 11.5" Trac-Rite (all gear) anti-spin differential, along with a Banks cool cover. Smooth and quiet as silk.
     
  9. Doug Ram

    Doug Ram Senior Member

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    For me, today IS shorts weather in upstate NY. It's a balmy 43F on the water. There is even a gentle wind out of the south. This winter continues its ridiculous warm snowless pattern. I will probably take my 10 horse skiff out to troll for trout late this afternoon! Water temps haven't dropped below 40, and its only 10 feet down to the winter (warmer) thermocline. Even the littlest Finger Lakes are ice free. Which is insane. At this rate there will be no ice fishing this winter. Weird, weird, weird. And Boring.

    SEND Snow Please!
     
  10. dhiller123

    dhiller123 Junior Member

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    Truck has 142k on it and is just starting to develop the Hemi tick when cold.

    I do run 5w20 Pennzoil High Mileage full synthetic, changed at 5k intervals.

    Come spring time, I plan to change axle fluids. Having just purchased the truck in June with 128k on it and no knowledge of the previous owners maintenance, I want to get all fresh fluids into it.

    Diller
    '14 Outdoorsman CC

    Sent from my SM-G988U1 using Tapatalk
     
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