Disappointing MPG

dhay13 · Jan 17, 2022

Here is a quick snippet of my actual vs my EVIC...

Riccochet · Jan 17, 2022

Cummins diesel said:
Here’s a load I pulled just the other day. 23,450 pounds plus truck and trailer. 9.2 average but I didn’t hand calculate that so could be a touch less. Got the air lift air bags and run them at 100psi. Needless to say that was a little too heavy. Truck pulled it pretty good but I should have used my dually.

Legally, you are stupidly over limit.

Cummins diesel · Jan 17, 2022

Riccochet said:
Legally, you are stupidly over limit.

So just out of curiosity how much can I legally pull with my truck. I just looked at the sticker on my truck and it says 6,500 pounds gvw on the rear axle. Front is 6k. Is that saying that anytime I have over 6500 pounds on the rear axle if I go over scales that I’m over weight? I grew up on a farm and we just pulled whatever we needed to with the trucks as long as they pulled it good. I knew the load was too heavy but am now curious what my actual legal weight is for the truck.

dhay13 · Jan 18, 2022

Cummins diesel said:
So just out of curiosity how much can I legally pull with my truck. I just looked at the sticker on my truck and it says 6,500 pounds gvw on the rear axle. Front is 6k. Is that saying that anytime I have over 6500 pounds on the rear axle if I go over scales that I’m over weight? I grew up on a farm and we just pulled whatever we needed to with the trucks as long as they pulled it good. I knew the load was too heavy but am now curious what my actual legal weight is for the truck.

What is your GCWR on that truck? Guessing maybe 25,000lbs? You said you had about 26,000 on the trailer plus the weight of the truck and trailer? That puts you at about 43,000lbs? Almost double what you should have been. I think maybe we misunderstood what you were saying cause that would likely put your rear axle way over 6500lbs? Bottom line is your total with the truck, trailer, load, you, fuel, spare tire and cup of coffee cannot be over your GCWR. You'd have to look up your truck to see what that is. I don't know off the top of my head but should be about 25,000lbs. If the truck weighs 9000lbs with you and everything in it and the trailer weighs 7000lbs then that puts you at 16,000lbs meaning you can only load about 9000lbs on the trailer. Best to go to a CAT scale at any larger truck stop to find out exactly where you are.

Riccochet · Jan 18, 2022

Cummins diesel said:
So just out of curiosity how much can I legally pull with my truck. I just looked at the sticker on my truck and it says 6,500 pounds gvw on the rear axle. Front is 6k. Is that saying that anytime I have over 6500 pounds on the rear axle if I go over scales that I’m over weight? I grew up on a farm and we just pulled whatever we needed to with the trucks as long as they pulled it good. I knew the load was too heavy but am now curious what my actual legal weight is for the truck.

Just googling it, but a 2015 2500 Longhorn diesel maxes out at 11,180 lbs towing capacity and 2100 lbs payload.

Axle ratings don't mean you can load 6500 lbs on an axle. You're not taking in to account the weight of the truck which is already on those axles. Pin weight on 25,000 lbs is close to 5000 lbs, if not more.

You are towing grossly over weight for that truck. Dangerously over weight.

dhay13 · Jan 18, 2022

Riccochet said:
Just googling it, but a 2015 2500 Longhorn diesel maxes out at 11,180 lbs towing capacity and 2100 lbs payload.

Axle ratings don't mean you can load 6500 lbs on an axle. You're not taking in to account the weight of the truck which is already on those axles. Pin weight on 25,000 lbs is close to 5000 lbs, if not more.

You are towing grossly over weight for that truck. Dangerously over weight.

Looks like he is towing a gooseneck so pin weight is likely much lower than a bumper pull or 5th wheel would be. I'm not an expert on goosenecks but from what i have read and heard it's nowhere near 20%

EDIT: but sounds like he is still extremely overloaded

Dean2 · Jan 18, 2022

dhay13 said:
Looks like he is towing a gooseneck so pin weight is likely much lower than a bumper pull or 5th wheel would be. I'm not an expert on goosenecks but from what i have read and heard it's nowhere near 20%

EDIT: but sounds like he is still extremely overloaded

5th wheel or Gooseneck, if the numbers he provided are right he is WAY past his GCVW and over the truck's GVW too. If the Gooseneck doesn't have at least 2800 pounds on it that too is unsafe. That unit should not be on the road.

JerryETX · Jan 18, 2022

18CrewDually said:
Not always. Everyone should hand calculate once in a while to check accuracy but I hand calculate every fill and it is within .1 accurate. I usually fill up below 1/4 tank plus the reserve tank so that's usually about 115 gallons of fuel. Even when I fill the main with 20ish gallons to fill it, it is accurate.
Now my old Ford, yes no doubt was a lie-o-meter usually being off close to .75 mpg to the negative.
Currently this time of year depending on how long the trips are and speeds it will be 13.5 - 14.8 mpg at time of fill-up. My truck unloaded is 9850#s. Considering it is a heavy duty truck with extraordinary capabilities, there is no comparison to a gasser hemi so I find those comments on this thread comical. It's like comparing a VW Beetle to a Porsche 911.
2 different machines with different capabilities and longevity doing it.

I'm sure some do calculate accurately. My previous 3 trucks were all within 1 mpg every time I checked. My current 2016 is off and it's not even close. I'm on average about 2 mpg less than what EVIC shows.

sandawilliams · Jan 18, 2022

But that extra 2 mpg makes you feel better even though its always wrong and not in your favor.

Cummins diesel · Jan 18, 2022

I

dhay13 said:
What is your GCWR on that truck? Guessing maybe 25,000lbs? You said you had about 26,000 on the trailer plus the weight of the truck and trailer? That puts you at about 43,000lbs? Almost double what you should have been. I think maybe we misunderstood what you were saying cause that would likely put your rear axle way over 6500lbs? Bottom line is your total with the truck, trailer, load, you, fuel, spare tire and cup of coffee cannot be over your GCWR. You'd have to look up your truck to see what that is. I don't know off the top of my head but should be about 25,000lbs. If the truck weighs 9000lbs with you and everything in it and the trailer weighs 7000lbs then that puts you at 16,000lbs meaning you can only load about 9000lbs on the trailer. Best to go to a CAT scale at any larger truck stop to find out exactly where you are.

I deleted my post because I didn’t realize how much overweight I was and don’t need DOT showing up at my door. I don’t normally pull anywhere close to that weight. Usually just a skid loader or mini excavator.

JerryETX · Jan 18, 2022

sandawilliams said:
But that extra 2 mpg makes you feel better even though its always wrong and not in your favor.

It does until I look down and see that's already time to fill up again.

Cummins diesel · Jan 18, 2022

Dean2 said:
5th wheel or Gooseneck, if the numbers he provided are right he is WAY past his GCVW and over the truck's GVW too. If the Gooseneck doesn't have at least 2800 pounds on it that too is unsafe. That unit should not be on the road.

The numbers I provided were correct. Only did it once and won’t be doing it again now that I realize how much over weight it was. Truck did have decent power though. I was still able to pass semis on the hills. Longest hill slowed it down to 58 mph and that hill was close to a mile long. 70mph speed limit on interstate. But like I said it won’t happen again.

dhay13 · Jan 18, 2022

Cummins diesel said:
I

I deleted my post because I didn’t realize how much overweight I was and don’t need DOT showing up at my door. I don’t normally pull anywhere close to that weight. Usually just a skid loader or mini excavator.

Nobody will show up at your door after the fact unless someone was injured or there was property damage. But that said, if the numbers you posted are correct I don't think even your dually could be legal with that much weight.

The numbers you need to pay close attention to are the axle weights (GRAR and GFAR) and the GCWR (Gross Combined Weight Rating). Those are the big ones you NEED to stay under. Payload should also be adhered to but that won't likely get you in as much trouble when towing. A CAT scale is your best friend when towing heavy. Only costs like $12.50 and you know where you stand then.

olyelr · Jan 28, 2022

18CrewDually said:
Not always. Everyone should hand calculate once in a while to check accuracy but I hand calculate every fill and it is within .1 accurate. I usually fill up below 1/4 tank plus the reserve tank so that's usually about 115 gallons of fuel. Even when I fill the main with 20ish gallons to fill it, it is accurate.
Now my old Ford, yes no doubt was a lie-o-meter usually being off close to .75 mpg to the negative.
Currently this time of year depending on how long the trips are and speeds it will be 13.5 - 14.8 mpg at time of fill-up. My truck unloaded is 9850#s. Considering it is a heavy duty truck with extraordinary capabilities, there is no comparison to a gasser hemi so I find those comments on this thread comical. It's like comparing a VW Beetle to a Porsche 911.
2 different machines with different capabilities and longevity doing it.

I hand calculated every single fillup for an entire year in my ‘17 ram 1500 and it was consistently always at least a half mpg to over 1 mpg off…with the dash gage reading higher than the hand calculation.

ticat928 · Feb 17, 2022

Dean2 said:
Something is wrong with that truck.

First Highway trip with my 2500 gas, long box CC. Mileage has been hand calculated on every tank. EVIC is within .2 pretty much every time. At 8000 Klms overall average is 16.4 mpg for 4x4 off road and gravel 50%, city 20% hihway 30%. Best highway mileage, 22.2 over a 220 mile run.

View attachment 482658

cdn gallon = 4,56 L
US Gallon = 3.79 L
HENCE the cdn gallon is 20.3% larger
hence your 22.2 mpg is actually 18.45 mpg

huntergreen · Feb 17, 2022

JeffLW said:
Received my 2022 2500 with the desiel engine about a month ago. My highway mpg is running about 20,but towing my travel trailer on level highway is giving 9.9 mpg's. This is less than what I was getting with my 2015 Hem 1500. I bought the deisel with the expectation of better mileage. Considering the extra cost of deisel fuel and maintenance, I think I made a mistake.

It’s not broken in yet.

ticat928 · Feb 17, 2022

huge differences in travel trailer frontal area.
diesel or gas, 9.9 mpg is all one can expect with a 12 foot tall trailer, even less with the slightest head wind

Dean2 · Feb 17, 2022

ticat928 said:
cdn gallon = 4,56 L
US Gallon = 3.79 L
HENCE the cdn gallon is 20.3% larger
hence your 22.2 mpg is actually 18.45 mpg

Absolutely true. 1 U.S. MPG equates to 1.201 Imperial MPG

raggdoll · Feb 19, 2022

olyelr said:
I hand calculated every single fillup for an entire year in my ‘17 ram 1500 and it was consistently always at least a half mpg to over 1 mpg off…with the dash gage reading higher than the hand calculation.

what's the best way to "hand calculate"? Easy steps, I'm very math challenged...

Dean2 · Feb 19, 2022

raggdoll said:
what's the best way to "hand calculate"? Easy steps, I'm very math challenged...

My not be a legit question but, divide liters used by kilometers driven divided by 100. Used 100 liters to drive 500 klms 100/5 gives you 20 liters/100. To convert to U>S. mpg. I U.S. gallon is 3.79 liters therefore 20liters/3.79 is 5.28 U.S gallons. 1 klm= .625 miles thus 100 klm is 62.5 miles. 62.5miles/5.28gallons So 11.84 MPG

Disappointing MPG

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