Mpg

TrickTruck · Jan 7, 2018

ChitownPS said:
The tire is a 325/50/22 I believe they are 35". I'm in the suburbs of Chicago. So lots of stop and go. Highest speeds around here are 40mph. This is all off the dummy gauge on the dash. It consistently stays at 12.9 to 13.0 with very little fluctuation. I'm considering different tuning. But need to do more research first.

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My '12 was minimax g3arhead tunes, got 18mpg on the highway at 80mph and around 15-16 in town running the same size tire. Hand calculated.

My '16 which has not been on a diet yet gets 11 around town and has done a best of 13.5 on the highway.

It's about to get a diet...

ChitownPS · Jan 7, 2018

I don't reset mine, it seems to start with high mpg and takes a really long time to stabilize to 13mpg. And I'm ******d so no regens here

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DEEZUZ · Jan 7, 2018

ckrueg said:
Yeah the whole goal of EGR is to cool combustion temps to reduce NOX, which also decreases the thermal efficiency of the engine. It also requires running more boost at any given time because a large portion of the air being sent in to the intake is exhaust which has very little oxygen. Part of the reason they went to DEF was so they could run less EGR while maintaining low NOX emissions. That's one reason why 6.7s get better mpg than 6.4s and why the newer rams with DEF do better than those without.

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Wut?

ckrueg · Jan 7, 2018

CTC DEEZUL said:
Wut?

That's my reasoning of why EGR doesn't increase fuel economy lol.

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DEEZUZ · Jan 7, 2018

We recycle exhaust to re burn unburnt fuel. If we have combustible gases re-entering intake, we use less fuel.

andrewtac · Jan 7, 2018

CTC DEEZUL said:
We recycle exhaust to re burn unburnt fuel. If we have combustible gases re-entering intake, we use less fuel.

Even if during the process the efficiency of the system is decreased? Also, does the feedback loop to determine fueling take into account the added reintroduced fuel and decrease fueling? I assuming fueling is based on throttle position, atmospheric conditions, load, and current vehicle state.

ckrueg · Jan 7, 2018

https://www.dieselnet.com/tech/engine_egr_emissions.php

I don't have access to the entire paper, but the abstract clearly states that EGR reduces NOX, increases Soot and increases fuel consumption.

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DEEZUZ · Jan 7, 2018

It reads to me their study didn't include the effect the vgt which can bring in more air without more fuel to spin turbo. sounds like their saying the added fuel consumption comes from needing to match air intake.

Trust me, were only talking about a point or 2, but it will certainly lower your mpg by removing EGR. But it evens out with the maintenance of a egr system.

DEEZUZ · Jan 7, 2018

We love DEF for sure. It allows to run much more and have a wide range of timing and such.

I can see now where there is a cooling effect from properly cooled EGR. That I did not know!

Filling the chamber with the EGR though, will definitely reduce fuel consumption

Jomax · Jan 7, 2018

It’s all a necessary evil. I wish more company’s would focus on keeping the emissions intact in terms of tuning.

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brock1129 · Jan 7, 2018

6" lift, 37x13.50r22, GH sotf, h&S low pressure pump, and no limit intake. Im in the burbs of pittsburgh. lots of stop and go. basically city driving. i get about 9mpg

BigRed97 · Jan 8, 2018

CTC DEEZUL said:
We recycle exhaust to re burn unburnt fuel. If we have combustible gases re-entering intake, we use less fuel.

The sole purpose of EGR is NOx reduction, via cooler combustion(hence less efficent)

DEEZUZ · Jan 8, 2018

Are you saying there is no combustibles in recirc'd exhaust?

HeavyAssault · Jan 8, 2018

I don't know about an intact EGR system "adding" MPGs, but I can say removing the EGR system has added MPGs and been sustained.

After March '15 the MPGs are increased and sustained over 16+ using various fuel additives. Some updates to my tuning have been applied, this is using the basic X4 device with aftermarket files. I'd love to add more MPGs with other tuning files, but the truck runs quite well for my needs and desires.

This graph below represents over 99k miles of driving, if you got other evidence to show please post it up.

Last I recall the EGR uses exhaust gases, not "un-burnt fuel". The purpose is to help "burn off" particulates that make up parts of the exhaust (soot??) by forcing them back thru the cylinders for another combustion cycle. I would need more info but highly doubt those particles are in any way a source of energy that allows for the creation of power in the motor.

Kolohe · Jan 8, 2018

HeavyAssault said:
I don't know about an intact EGR system "adding" MPGs, but I can say removing the EGR system has added MPGs and been sustained.

After March '15 the MPGs are increased and sustained over 16+ using various fuel additives. Some updates to my tuning have been applied, this is using the basic X4 device with aftermarket files. I'd love to add more MPGs with other tuning files, but the truck runs quite well for my needs and desires.

This graph below represents over 99k miles of driving, if you got other evidence to show please post it up.

Last I recall the EGR uses exhaust gases, not "un-burnt fuel". The purpose is to help "burn off" particulates that make up parts of the exhaust (soot??) by forcing them back thru the cylinders for another combustion cycle. I would need more info but highly doubt those particles are in any way a source of energy that allows for the creation of power in the motor.

He's been around a while....

Smokun · Jan 8, 2018

Remember if your truck idles a lot it will eat away at your fuel mileage indicator. I average around 12 in town and I drive like a dick. 17 on the highway driving sain

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BigRed97 · Jan 8, 2018

CTC DEEZUL said:
Are you saying there is no combustibles in recirc'd exhaust?

Nope, I'm saying the amount is so negligible that it has zero effect

slc6oh · Jan 8, 2018

I'm a pretty consistent 14 around town, went from salt lake to olathe colorado last weekend witch is about 340mi and lie-o-meter (witch is usually within .25mpg of dead nuts) was showing 21.5.

light weight exhaust, no limit stage 2 intake, and tyrant sotf tuning on level 4 (150hp I think it is)

fwiw, I seem to get better when there's stanadyne in the tank... witch is what these numbers reflect.

Jomax · Jan 8, 2018

slc6oh said:
I'm a pretty consistent 14 around town, went from salt lake to olathe colorado last weekend witch is about 340mi and lie-o-meter (witch is usually within .25mpg of dead nuts) was showing 21.5.

light weight exhaust, no limit stage 2 intake, and tyrant sotf tuning on level 4 (150hp I think it is)

fwiw, I seem to get better when there's stanadyne in the tank... witch is what these numbers reflect.