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Discussion Starter · #1 ·
Love the COMPLETE guage info available, but a bit worried by what looks like high transmission oil temps: gets to >185 degrees fairly fast. I thought it was supposed to be below 175 degrees for long term reliability??

2021 BigHorn Quad Cab, 6'4" bed 5.7L hemi, 4 wheel drive, new truck, now has 350 total miles

A bit disappointed in MPG performance, as shown by the MPG number in the display:
Flat freeway (Sacramento valley) ~ 55 degrees, zero wind. excellent road: asphalt redone in last year, LRR tires @ 37psi:

73 MPH shows 16/17 MPG (mostly 16 MPG)

71 MPH shows 17/18 MPG

69 MPH shows 18/19 MPG

67 MPH shows 19/20 MPG and also see the "ECO" indicator come on

Not sure how accurate that number is - any idea on accuracy?
 

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Trans temp is normal for the 8 speed. It has a heat exchanger that uses coolant to heat and cool the fluid for better MPGs and wear. (per FCA).
 

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Discussion Starter · #4 ·
OK, thanks. I noticed that temp did climb very rapidly, faster than normal heat up, and was a bit worried, but it sounds like Dodge wants a minimum as well as a maximum temperature
 

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19 RAM 1500 5.7 Etorque. Falcon Wildpeak AT3W/ JMS PedalMax/weatherTech TechLiner/Gator Quad fold
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Love the COMPLETE guage info available, but a bit worried by what looks like high transmission oil temps: gets to >185 degrees fairly fast. I thought it was supposed to be below 175 degrees for long term reliability??

2021 BigHorn Quad Cab, 6'4" bed 5.7L hemi, 4 wheel drive, new truck, now has 350 total miles

A bit disappointed in MPG performance, as shown by the MPG number in the display:
Flat freeway (Sacramento valley) ~ 55 degrees, zero wind. excellent road: asphalt redone in last year, LRR tires @ 37psi:

73 MPH shows 16/17 MPG (mostly 16 MPG)

71 MPH shows 17/18 MPG

69 MPH shows 18/19 MPG

67 MPH shows 19/20 MPG and also see the "ECO" indicator come on

Not sure how accurate that number is - any idea on accuracy?
The current mpg read out is fairly accurate. The average mpg readout tends to be a little off by 1-2 mpgs. But your mpg will increase as you break in the engine. Also keep in mind that we're in winter now so we have the winter gasoline blend even in places that have 60+ degree weather like where I'm at (Las Vegas). So expect those numbers to go up a little when the warmer weather returns.
 

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does the winter gas drop the MPG much? some data I read said ~ 2%. Any comment about the sharp drop off in MPG as speed gets above 70 MPH?
Yes, my MPG drops with winter gas and by more than 2%. The cold temps don't help as well. Why do the MPGs go down the faster you go? Try pushing a brick through the air, there is a lot of drag. That's one of the reasons the air ride equipped trucks lower the body at speed to try and reduce drag. You probably would not remember but back in the day when we had a gasoline shortage, the gov reduced the speed limits everywhere to 55 mph to save fuel. Ugh, that will show my age, lol!
 
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19 RAM 1500 5.7 Etorque. Falcon Wildpeak AT3W/ JMS PedalMax/weatherTech TechLiner/Gator Quad fold
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does the winter gas drop the MPG much? some data I read said ~ 2%. Any comment about the sharp drop off in MPG as speed gets above 70 MPH?
More like 2 mpg in winter gas blend. Aerodynamics as far as speed goes. On flat terrain no wind it's common to retain gas mileage all the way up to 75mph for a engine that's broken in..
 

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I have a 2014, I've been reset trip computer often and hand calculate fuel economy, the computer usually displays 1 ~1.5L/100km better than hand calculation. Another note is I used to get close to 20mpg with factory tires, once I switched to BFG ko2s (same tire size), mpg went down by about 2~3mpg for all cases (city, freeway, summer, winter).
 

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All vehicles that had a digital mpg I have owned in the 2000 and above have always been 10% optimistic, exception being the 2015 Outback. That was either 3% low to 3% high. The most accurate in my limited experience.
I am in an '18 4x4 Crew, 5.3, 3.23, 20s well aired and indicates 22+ yielding 19.7 to 20 and I drive like an OLD man, cause I iz. And in the country to boot where my avg speeds are 45 - 60. It will kick down to V6 at times but if I coast to a stop, (I live in the country), it stays in 8 cyl mode. Why? It idles w AC off in V8. Seems like wonky programming to me.
I would seriously doubt the 5.7 getting an honest, pen n paper 22 at 70mph, flat and level.
I am looking for a Ram for the ride, Ramboxes and Adaptive. I'd even gamble on a 3.6 but seriously doubt I could see 25mpg w same conditions and resale? It would be one white elephant! Not sure w the coming socialist inflation that I could afford those mpg #s.
 

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Discussion Starter · #11 ·
All vehicles that had a digital mpg I have owned in the 2000 and above have always been 10% optimistic, exception being the 2015 Outback. That was either 3% low to 3% high. The most accurate in my limited experience.
I am in an '18 4x4 Crew, 5.3, 3.23, 20s well aired and indicates 22+ yielding 19.7 to 20 and I drive like an OLD man, cause I iz. And in the country to boot where my avg speeds are 45 - 60. It will kick down to V6 at times but if I coast to a stop, (I live in the country), it stays in 8 cyl mode. Why? It idles w AC off in V8. Seems like wonky programming to me.
I would seriously doubt the 5.7 getting an honest, pen n paper 22 at 70mph, flat and level.
I am looking for a Ram for the ride, Ramboxes and Adaptive. I'd even gamble on a 3.6 but seriously doubt I could see 25mpg w same conditions and resale? It would be one white elephant! Not sure w the coming socialist inflation that I could afford those mpg #s.
My old 2009 (4.7L) read ~ 7 or 8 % high on the digital MPG based on a LOT of data: many many gas tanks full.This was the Total MPG, not the instantaneous one. Still waiting to fill up tank - dealer had filled tank, I drove 50 miles and then re-filled it. The truck would occasionally get an honest 20MPG on freeway trips when traffic limited speeds to 65 or less- and I was "drafting" a lot due to traffic

I know the odometer and speedometer were dead on, so error must come from fuel usage
 

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Discussion Starter · #12 ·
Just filled the tank:
303.6 miles 22.37 Gallons = 13.57MPG mid grade Arco gas
Gauge read 14.1 MPG, about 4% high

So, disappointing mileage,considering 40% were freeway miles, rest suburban/urban
Gauge not bad, better than my old truck
 

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Just filled the tank:
303.6 miles 22.37 Gallons = 13.57MPG mid grade Arco gas
Gauge read 14.1 MPG, about 4% high

So, disappointing mileage,considering 40% were freeway miles, rest suburban/urban
Gauge not bad, better than my old truck
By the time you put a few thousand miles on and have done an oil change you'll see your mpg rise a little.
 

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'21 Bighorn 4x4-5.7 3.21 hemi eTorque-Night, level 2, 12", Alpine, pan roof, pwr steps, FX mega
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I hope to see that mpg rise... I'm at 3400 mi and the fuel eco SUCKS compared to my last few trucks. Avg 12-14 now.

'21 bighorn hemi 5.7e
 

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So weird how so many people mpg has different averages. But keep in mind...there are a lot of variables like: temperature, humidity, elevation, gas/oil being used, how you drive, etc. Personally...I get 23-24 highway easily. But in in Las Vegas and don't usually drive any faster than 70 at the most. Plus...don't do a lot of uphill driving.
 

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Discussion Starter · #17 ·
So weird how so many people mpg has different averages. But keep in mind...there are a lot of variables like: temperature, humidity, elevation, gas/oil being used, how you drive, etc. Personally...I get 23-24 highway easily. But in in Las Vegas and don't usually drive any faster than 70 at the most. Plus...don't do a lot of uphill driving.
yeah - can all you who responded with your MPG numbers add in : gas type (Regular, Premium, etc) , Brand, driving conditions, etc? I know freeway driving gets much different mileage, so if you can give separate figures for freeway and combined
 

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'21 Bighorn 4x4-5.7 3.21 hemi eTorque-Night, level 2, 12", Alpine, pan roof, pwr steps, FX mega
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I was out today and looking at the dash a lot... Shell 89 oct gas, not 'gunning' at all, here are some numbers. flat roadway, no wind, temp 36f, mostly on cruse control to measure,
and a bit surprised here, each run was about 4-5 miles long: 40 mph 18-19 mpg | 50mph 18-17 mpg | 60mph 14-15 mpg | 70 mph 10-11mpg now that SUCKS!
At highway speed I'll kill a tank in no time, avg on display read 14.2 today I did a round trip of 160mi, a little over 1/2 a tank.
And I have the 3.21 rear said to be better on fuel. I hope it does improve with age and warmer weather, other wise I see an early trade coming...
 

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19 RAM 1500 5.7 Etorque. Falcon Wildpeak AT3W/ JMS PedalMax/weatherTech TechLiner/Gator Quad fold
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I was out today and looking at the dash a lot... Shell 89 oct gas, not 'gunning' at all, here are some numbers. flat roadway, no wind, temp 36f, mostly on cruse control to measure,
and a bit surprised here, each run was about 4-5 miles long: 40 mph 18-19 mpg | 50mph 18-17 mpg | 60mph 14-15 mpg | 70 mph 10-11mpg now that SUCKS!
At highway speed I'll kill a tank in no time, avg on display read 14.2 today I did a round trip of 160mi, a little over 1/2 a tank.
And I have the 3.21 rear said to be better on fuel. I hope it does improve with age and warmer weather, other wise I see an early trade coming...
If you don't change driving habits and conditions stay the same except for weather...you'll definitely see an increase in mpg. 26k miles on my Etorque now and my average today after fill up with Arco 89 octane was 24.7. I probably won't be driving this weekend but I'll try to get a photo of it on Monday.
 
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