Gas Milage 2019 Rebel 5.7

[mpurkey]

Took my first road in my Rebel. 600 miles or so and averaged 19.0 mpg. Seems I would get better Milage with MDS turned off than with it engaged.

 

[SacRebel]

What speed were you driving?

The best I can get is about 15 mpg on flat highway using cruise control at 75.

 

[CaptainCJ35]

What speed were you driving?

The best I can get is about 15 mpg on flat highway using cruise control at 75.

I have 2500 miles on mine. I've been noticing a steady increase in mileage as it breaks in. Just did a 300+ mile trip up to Hanover NH and back yesterday with a round trip average of 18.1 mpg. This includes mild city traffic thru Boston. My cruise was set to 72 MPH, though for stretches I traveled faster. That's simply going by the computer, but I have no reason to suspect is off by a measurable degree.

At 72, MDS was on a lot. Oddly, during some steeper downhills it would shut off and come back on when things flattened out... engine breaking maybe?

So far I'm fine with fuel mileage. I knew before getting the truck it wasn't going to be great on gas. If MPG keeps improving as it's been, and I can end up coaxing 20 mpg out of it, cruising around 70-75... I'll be thrilled. Not holding my breath there, but the improvement over time has me optimistic.

 

[Neurobit]

What speed were you driving?

The best I can get is about 15 mpg on flat highway using cruise control at 75.

That's pretty low. Do you have 3.92 gears?
I averaged ~19.7 on a recent trip to FL (>600 mls) at 75 MPH (see my Fuelly sig for details).
City is a different story for me. I have a commute that is less than a mile, which kills my city mileage no matter which vehicle I drive.

Cheers,

 

[Rampat]

That's pretty low. Do you have 3.92 gears?
I averaged ~19.7 on a recent trip to FL (>600 mls) at 75 MPH (see my Fuelly sig for details).
City is a different story for me. I have a commute that is less than a mile, which kills my city mileage no matter which vehicle I drive.

Cheers,

How do you get your Fuelly to link to your sig?

 

[Neurobit]

How do you get your Fuelly to link to your sig?

Sorcery.

 

[Rampat]

Sorcery.

I'm starting not to like you, you know that?

 

[jmac]

I have 11k miles. 3.29 gears and average about 19.5 combined. when all highway I get 22mpg

 

[SacRebel]

Yes, I have a 3.92 diff so I get that. But still if it makes that much of a difference then FCA should have had a separate fuel estimate for the vehicle.

 

[RTRebelRam]

whats MDS?

 

[Neurobit]

Yes, I have a 3.92 diff so I get that. But still if it makes that much of a difference then FCA should have had a separate fuel estimate for the vehicle.

Not saying that it's just that, but it plays a part. Agree that it's on the lower end of what you should be seeing, and it can't be that it needs to be broken in. I made the same drive to FL two days after I bought my truck and got ~ 18.6 , so that's not it.

 

[Neurobit]

whats MDS?

Acronym for Multi Displacement System (switches off 4 of the 8 cylinders when load is low to save fuel).

 

[RTRebelRam]

Acronym for Multi Displacement System (switches off 4 of the 8 cylinders when load is low to save fuel).

Interesting ... how do i activate/deactivate this?

 

[b1gj0n44]

I thought all Rebels came with 3.92 gears. I was getting about 14 mpg at first, then had to have a fuel injector replaced that was flowing at a higher rate... now i am averaging 15.5-16.3 mpg.

 

[mpurkey]

I should have been more clear in my post. My speed was whatever the speed limit was which was 65-70 ish and the trip was from Raleigh to East Tennessee via interstates 40, 74, 77 and 81. I do have the 3.92 gearing option.

 

[Jtr]

My speed was whatever the speed limit was which was 65-70 ish

This is pretty close to the magic zone before MPG starts to tick down.

 

[mpurkey]

Interesting ... how do i activate/deactivate this?

The only way I know to deactivate it is to slept the - one gear sign and then up to 8. Also tow/haul defeats the MDS I believe. No expert though as I’m a relatively new Ram owner.


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[Neurobit]

The only way I know to deactivate it is to slept the - one gear sign and then up to 8. Also tow/haul defeats the MDS I believe. No expert though as I’m a relatively new Ram owner.


Sent from my iPhone using Tapatalk

100% correct. They both deactivate MDS, and reset when engine is turned off.

 

[CaptainCJ35]

100% correct. They both deactivate MDS, and reset when engine is turned off.

I think the gear selector resets when you put the truck in Park, not just when you shut if off.

 

[Neurobit]

I think the gear selector resets when you put the truck in Park, not just when you shut if off.

That could be right. I’ve just never had a reason to check