Cruise and MDS

[jag1886]

I went on a 300 mile drive this weekend using the cruise control and the ECO light never once came on. Does that mean it doesn't work while using cruise?

 

[Upthewazzu]

Were you heading up towards McCall or something? Not sure why it wouldn't come on with cruise control.

 

[charonblk07]

I went on a 300 mile drive this weekend using the cruise control and the ECO light never once came on. Does that mean it doesn't work while using cruise?

The MDS was still activated but you weren't driving in the most economic way. You can have the MDS on without the ECO light active, it will also be dependent on the engine load and speed you're travelling at.

 

[HemiRoar]

ECO light & MDS have no correlation.
I disabled my ECO light after 2 weeks of owning it.

 

[SilverStreak88]

My model didn't come with an ECO light or what not, but when the MDS kicked in on my year model you can feel it. I disabled mine and much to my surprise, my mileage went up. I think that the MDS system is more refined now in the Gen4's from the Gen3's and seems to work better. My year did happen to be the first year that Dodge rolled out the MDS HEMI's, just wish mine was an early 07' without it.

 

[HemiRoar]

My model didn't come with an ECO light or what not, but when the MDS kicked in on my year model you can feel it. I disabled mine and much to my surprise, my mileage went up. I think that the MDS system is more refined now in the Gen4's from the Gen3's and seems to work better. My year did happen to be the first year that Dodge rolled out the MDS HEMI's, just wish mine was an early 07' without it.

My mileage also went up after MDS disable. I do mostly city driving and it was more annoying to get it to kick out of MDS, downshift and go.
Maybe highway driving would have been different.

I now own a 2014 300C and you can't even tell when MDS kicks in and out. The pedal is also very sensitive and the transmission is programmed very well.
They've really got it down.

 

[SilverStreak88]

My mileage also went up after MDS disable. I do mostly city driving and it was more annoying to get it to kick out of MDS, downshift and go.
Maybe highway driving would have been different.

I now own a 2014 300C and you can't even tell when MDS kicks in and out. The pedal is also very sensitive and the transmission is programmed very well.
They've really got it down.

It always seemed to go in and out at the wrong times, I could be on flat road and it would never kick in. I do mostly city also, I just changed up the tune with my Superchip and since my trans rebuild with the shift kit it's pretty nice. I feel the torque now and it pulls like a mother, granted when they stripped it they said my clutches were toast so... I've been trying to get good gas mileage here lately and drive like a grandpaw which I actually seem to enjoy. High gas mileage in a HEMI is a commodity every HEMI owner want's. I can't even imagine how many times you have to see the pump a week in a Hellcat. I'm going out of town this weekend on a 200 mile trip so I would like to see what I get with this new tune.

 

[noupf]

wtf the is an eco light? I thought i read somewhere that the 2014's+ dont have that light anymore.

I have a 2015 sport cc and have never seen this mystic eco light...... I use cruise control, drive like a grandpa once in a while to raise my avg mpg and have never seen this light ( and i've tried to look and see if it ever comes on, i see nothin' )

 

[Limeybastard]

wtf the is an eco light? I thought i read somewhere that the 2014's+ dont have that light anymore.

I have a 2015 sport cc and have never seen this mystic eco light...... I use cruise control, drive like a grandpa once in a while to raise my avg mpg and have never seen this light ( and i've tried to look and see if it ever comes on, i see nothin' )

Not a fact but an observation . I could have sworn I got less per tank when I turned the eco off in menu.

 

[Quint]

wtf the is an eco light? I thought i read somewhere that the 2014's+ dont have that light anymore.

I have a 2015 sport cc and have never seen this mystic eco light...... I use cruise control, drive like a grandpa once in a while to raise my avg mpg and have never seen this light ( and i've tried to look and see if it ever comes on, i see nothin' )

You need to turn the ECO light on in the settings. Otherwise you won't see it. That's how my 2015 works.

 

[Recon12]

After 9 posts. Quint nailed it. There are many "secrets" in the manual.

 

[Kotta390]

My model didn't come with an ECO light or what not, but when the MDS kicked in on my year model you can feel it. I disabled mine and much to my surprise, my mileage went up. I think that the MDS system is more refined now in the Gen4's from the Gen3's and seems to work better. My year did happen to be the first year that Dodge rolled out the MDS HEMI's, just wish mine was an early 07' without it.

2007 was not the first year for MDS in these trucks. It was 2006, I know because I have friends with 04 and 05 models and NO MDS, but my 2006 did and I also saw no fuel mileage increase or especially no decrease when I had it turned off.

 

[jag1886]

Bet I know why. The speed limit is now 80 MPH here in Idaho, would going 80 make it stay off.

 

[MyOhFive]

Not a fact but an observation . I could have sworn I got less per tank when I turned the eco off in menu.

"eco" light does nothing more than tell you you're driving economically. So this is purely coincidence.. or you're nuts.

 

[Limeybastard]

"eco" light does nothing more than tell you you're driving economically. So this is purely coincidence.. or you're nuts.

Sounds about right lol

Sent from my SM-N910T using Tapatalk

 

[htwo]

I find that with my 2011 5.7, I get the best mileage (and thus range) at 65mph. If I push it to 70 I don't lose much. Using cruise control can go either way in terms of mileage depending on your geographical location. I have very light hills here, nothing too major by any means and it's best to gradually throttle up with losing a bit of speed knowing you'll regain the speed - and then some - going down the hill. Cruise control in this case will burn more fuel by often downshifting a gear depending on the grade, let along maintaining a set engine speed when it's not always necessary. Setting my cruise above 65mph just means I play in traffic more, instead of letting everyone pass and waste their fuel.

Speed generates heat as well, in bearings, etc, which adds drag on top of the heavy wind resistance already set. I'm not sure what the parameters of the MDS system is, but after getting more than 600kms a tank in split city/highway driving from just watching my throttle position and driving habits makes all the difference. I notice a drop in mileage when I select gears manually. It's hard to keep the HEMI 'on boil' even with 3.55 gears in the city as 35mph in second gear is only around 2500rpm, well below the torque peak of the engine.

I believe in the first gen 5.7's the MDS would only be effective up to a certain speed, and it was increased in the latest programming for the 2009+ trucks.

 

[SilverStreak88]

2007 was not the first year for MDS in these trucks. It was 2006, I know because I have friends with 04 and 05 models and NO MDS, but my 2006 did and I also saw no fuel mileage increase or especially no decrease when I had it turned off.

You are correct, I forgot about the 06's getting it. I rarely see an 06' with MDS around me, but the MDS system was introduced in 2004 on the HEMI and was rolled out in 2005 on the 300C, Charger, Magnum and Grand Cherokee.

 

[Kotta390]

You are correct, I forgot about the 06's getting it. I rarely see an 06' with MDS around me, but the MDS system was introduced in 2004 on the HEMI and was rolled out in 2005 on the 300C, Charger, Magnum and Grand Cherokee.

Oh I know! Lol I was merely stating this for the trucks. To be honest I rarely see the 2006 trucks. New headlights with old tail lights.