[Bjorn]

I realize this may seem like a silly topic to some for being a truck owner, however I drive 30k miles a year so it's semi important to me. I traded up my Jeep Cherokee to the 2016 Rebel with 5.7 Hemi. I needed more oompf to tow a new boat I purchased. Towing is a once in a while thing however I need to be able to do it when I need to be able to do it. 99% of my driving is on I75 in Florida. Super flat and perfect climate. I expect to get whatever the sticker says for hwy MPG in these conditions. Example, my Jeep Cheroke Trailhawk with the Tow and Offroad package was rated at 24mpg hwy and I actually got around 25/26. My overall average MPG was 24 just to give a true picture of my driving habbits. I just hit 1,240 miles on the Rebel and I'm aware that there's a 2,000 break in period. Currently I am seeing around 16 MPG hwy on my normal commute which is far short from the low 20s that the dealer promised I would get. I'm using cruise control between 70-75 mph and always using a light foot when not on cruise to satisfy the what the dealer told me is the computers learning period for my driving habbits. Unless there is a drastic change in this break in period I don't see how I'm going to magically gain another 5 or more mpg in 800 miles. With the current cost of fuel and the amount of millage I drive, I calculated this to be about a $60 difference per month from what I'm getting mpg vrs what I was told I would get.

That all being said to lay the background picture, has anyone come across any tips or tricks to improve the mpg on these things? I feel like maybe the cylinder deactivation is not really working under cruise and light load situations. At the above mentioned cruising speeds I'm right around or just under 2k rpm. The dealer told me cylinder deactivation should happen below 2,500 rpm under light loads. Is there maybe a tune or somethign I can do to fix this?

 

[TooByFoor]

Curious about this, too. I'm sort of thinking they didn't adjust their numbers to compensate for the LT tires. I'm getting about 15mpg after 3,500 miles, which is a bit surprising since I was getting closer to 19 on my other 1500 with P tires. I'm going to ask the dealer about it on Monday, when my truck is in for some other issues. I realize 15 is technically within the range, and we don't buy trucks for mpgs, but if you are gonna advertise something, it should be valid.

 

[Bjorn]

Yeah, oddly enough I actually get better than expected mpg in town but the hwy is killing me. I'd be thrilled if I was a local driver but unfortunately my commutes see me mostly on the highway. When I questioned my dealer, they said that the 3.92 rear was also impacting the efficiency. I feel that the window sticker for mpg should also reflect the options that are on the window sticker. They adjust the mpg to compensate for the 4x4 but apparently not for the tires and rear. Based on what I see, it should say 14 city / 16 highway.... Unless someone has found a way to travel downhill both directions, I don't see how anyone would ever 21 mpg on a highway.

I just filled the tank again and going to reset one of the trip meters when I get up to speed today and then check it before I get off the exit. That should give me an idea of 100% hwy mpg I'm getting currently

 

[iamarebel]

Iam only getting like 12.9 I have 2200 miles on it

 

[VaderRebel]

1800 miles on mine and I have a very steady average of 17 mpg, BUT, I have a very heavy foot and this Rebel is just so **** fun to drive I don't even look at the mpg often.

 

[Brent]

I have about 5500 miles and just drove 311 miles doing 70 on the highway and only got 15 mpg.

 

[Bjorn]

reset the trip log after hitting cruise control at 70 mph. 43 miles of flat highway and before I got off the exit i was at 16.4. Hopefully theres' a tune or some update that fixes this. I really feel like the cylinder deactivation is not working when it should be

 

[BCT]

I'm at 2100 miles and get around 15.5-16 mpg at the moment. I hit it pretty hard. The Rebel is a blast to drive. It's my first HEMI and Itakes me smile every time I drive it... just like my Rubicon!

 

[johnj]

I'm still averaging about the same with mine.

 

[Bjorn]

ok, so it seems like what I'm seeing isn't going to really change past the break in period like the dealer claimed. Has anyone heard of a tune or chip that helps which won't effect the warranty? Is it worth bringing this up to RAM to check and see if the cylinder deactivation is working properly? I really love the truck for all other aspects but if I can't find some options I may be looking at getting out of it and switching over to an F150 EcoBoost

 

[rapids]

I was just told yesterday my truck is leaving Warner Truck on the 23.....Nice Christmas gift to me!!!! Tee Hee!!
Sorry I will stay focused!!
I know when she arrives I won't even look at the mpg......its a truck, just like my Avalanche when it needs gas I pull into the pumps.
That said I understand folks disappointment concerning the advertised mpg, they should address that!
If this helps any, try living to Canada with all of our gas tax's and carbon tax's...... You guys south of the boarder are way lucky!!!!

 

[Bjorn]

1800 miles on mine and I have a very steady average of 17 mpg, BUT, I have a very heavy foot and this Rebel is just so **** fun to drive I don't even look at the mpg often.

If I was getting this and having fun driving it, I'd be happy. I'm driving it like the pedal is made from and egg carton and getting less MPG than you. Again our highways here are as flat as can be and it certainly isn't cold out. What rear do you have? From my understanding the only options in the Rebel were the 3.92 that I have or a 3.21. My dealer told me that the 3.21 wouldn't be good for towing though.

 

[VaderRebel]

I've got the 3.92's, it definitely dips down to 13-14 in the city but like I said it's been pretty good at staying up there on the average. I am not shy with the gas pedal at all, but I can say that the eco light is on constantly, could this be a software issue for some?

 

[Bjorn]

I've got the 3.92's, it definitely dips down to 13-14 in the city but like I said it's been pretty good at staying up there on the average. I am not shy with the gas pedal at all, but I can say that the eco light is on constantly, could this be a software issue for some?

Eco light?? I don't think I've ever seen that. The only thing I see is the Aero sysmbol that shows me the vehicle height. I have it set to Aero all the time rather than normal and waiting for it lower at speed hoping that would help some. If there's an indicator light for the cylinder deactivation, I'm not aware of it and neither was my dealer when I asked them if there was a way to tell if it was kicking in or not. I'm starting to think that maybe I didn't get the most informed group of individuals at my local dealership. If that's the case, and it's software issue for some of us that's preventing the eco system to kick in, then maybe it's an easy fix and I'll be a thrilled customer all around

 

[johnj]

The ECO light is just a green flashy pretty that tells you when you're driving in an economical fashion. Probably just tied to the vacuum system. I'm convinced that if you're moving at more than 5mph and your foot's off the pedal, it's gonna light up pretty.

It does not tell you when the MDS kicks in.

The ECO light is in the bottom corner of my display, the Rebel instrument cluster. I don't know if it moves or goes away as you reconfigure the display. I reconfigured mine once or twice so I don't recall if it was there by default.

 

[Bjorn]

looking all over it and no sign. I pulled out the manual and it says that it's an option in the screen set up but when I go in there it's no where to be found?? Mine is a 2016 and fully optioned out. Can't imagine why it'd be any different.

 

[KnightReb31°]

looking all over it and no sign. I pulled out the manual and it says that it's an option in the screen set up but when I go in there it's no where to be found?? Mine is a 2016 and fully optioned out. Can't imagine why it'd be any different.

Might be a chance its disable for access through what may be the main screen with the ability to be enabled through some back end screen.

Just a thought.

 

[VaderRebel]

I can't remember off hand what screen it's on, but it's in there, trust me! Took me a few minutes to find it. I do believe that it indicates the MDS kicking in since the tone of the engine changes every time the indicator comes on. The tone changes with a slight adjustment to gas pedal pressure to resume full power. It also feels slugish when the indicator is lit. It will be bellow to the left of the speed or truck image in the digital part of the cluster.

 

[johnj]

You can control the ECO light from the Unconnect system menu. It's under:
Settings > Display > Fuel Saver Display in Cluster
I turned mine off.

 

[Bjorn]

its difinitivly not in there so I stopped at the dealership to ask them since I was in the area. The sales crew got one of the techs to come up from the service department and he said that the eco light and the mcds doesn't come available until after 2,000 miles. He said it's built into the computer on a timer to allow for the break in period. He said the light will be accompanied by a discinct difference in sound to the engine just like you mentioned above. I've never heard a difference in engine tone yet so maybe this all correct? I'm approaching 1,700 miles now so I guess I'll just have to wait and see