MPG calculations wrong?

[dtowneclipse]

Good afternoon all!!

2021 2500, 4WD, 14k Miles.

My calculated mileage on the dash is consistently 3-4mpg higher than actual....and occasionally 5-6 higher when towing a heavy load. It has been this way from mile 0. I am averaging per tank 19-22 MPG hand calculated depending on route, speed, location, etc....but the calculated mileage on the screen reads 22-26. Anybody else have this issue?

 

[kthaxton]

Wow....they both seem high. I compared my gauge to hand calculation once when it was new....the gauge was within 1 mpg. Per the gauge, I normally get between 15-16 unloaded. Loaded, varies with my load, route and wind, but usually somewhere between 11-13 mpg.

 

[dtowneclipse]

75-80 interstate travel, hand calculated is 19.5 to 20. 55-60mph hand calculates to 22 to 23 occasionally. Hand calculated mileage has been inching up since the truck was new. I just don't understand why the dash is so far off. My last yrs hunting trip to/from colorado, pulling a 16' trailer, with about 5k of supplies, 2400 miles round trip, yielded a calculated 11.2mpg. Dash showed 17.

 

[bcbender]

Mine is generally up to about 10% on the optimistic side. It'll say 11 when I get ~10... or it'll say 17 when I am getting 15~16... so the higher the mileage the higher the error.

 

[AH64ID]

My average error is 7% optimistic, but it varies.

I’ve had 5 tanks in 43K miles go above 15% error with 20% being the worst.

I’ve had 7 tanks where the EVIC was lower, as low as 8.9%.

But for the most part 10% is a good guesstimate while driving and usually I get a little better than that.

 

[Cummins12V98]

Normal towing I am .4 high but bucking head wind or climbing it is nearly right on.

 

[BigPapa]

I am averaging per tank 19-22 MPG hand calculated

Do the new trucks really get this kind of mileage?

 

[NIsaacs]

Do the new trucks really get this kind of mileage?

Yes, mine does.

 

[BigPapa]

Yes, mine does.

Sweet. I had no idea. What year did that change?

 

[AH64ID]

My 18 doesn’t get that kind of mileage at those speeds, I’d have to slow to 60-65 to get 19-22.

 

[lpennock]

My 18 doesn’t get that kind of mileage at those speeds, I’d have to slow to 60-65 to get 19-22.

My 18 has never seen over 15.x, but then again I have a DRW w/4.10.

 

[Cummins12V98]

My 18 has never seen over 15.x, but then again I have a DRW w/4.10.

Same here!!!

 

[06 Dodge]

Attached is my latest fuel mileage, I was shocked to see Hand Calculated mileage number at 18.48 when EVIC read 19.4 when I filled but was at 19.5 at the house 4 miles before I filled it back up, did not think these new truck got fuel mileage this good being my first combo with city was 13.6. Oh these miles were 90% Hwy 10% city driving, Hwy speeds between 55 & 70 MPH. Will see how it does this weekend when I take a one day short 230+ mile road trip.

 

[NIsaacs]

Yes, mine does.

https://www.turbodieselregister.com/threads/nicks-new-ram-2500.271226/page-12#post-2695025

 

[bcbender]

yeah,.. highway mileage is pretty good under 65,.. But here in NC where 80 is keeping up,.. It gets about 16. still better than my 04 in those conditions.

 

[06 Dodge]

yeah,.. highway mileage is pretty good under 65,.. But here in NC where 80 is keeping up,.. It gets about 16. still better than my 04 in those conditions.

I have learned if others want to drive 80 and they do on I-5 in WA, OR & CA does not mean I have to drive that fast, that is why the have more then one lane on the freeway

 

[BigPapa]

that is why the have more then one lane on the freeway

 

[bcbender]

yep... and I tow at speed...... get another hundred or two miles in a day farther, fuel cost is not that much difference. 55~65 in South Dakota, WY, or MT would be a long day.

 

[06 Dodge]

I get it been their but now that I'm retired an our $$ grows shorter by the day I've been looking for ways to save all I can

 

[bcbender]

Looking forward to being retired... Hope we can still have the finances and freedom when that time comes to use out RV and see more of North America....