My truck will barely hold at 45 mph with 4:10s. I see an increase of 2-3 mpg in MDS mode, truck just won't hold it. What are everybody else's expirences?
The MDS on my 06 Laramie kicks in as long as I'm under 70 it seems. Just gotta put the cruise control on nad if I'm doing 70 or less it usually kicks in shorty after.
My friends 06 4x4 QC Laramie will hold it at 65 on level highway with 3:92's. I took it on a road trip last summer. With the window rolled down it's very easy to hear it go in and out. If you drive above the speed you want to cruise at, example 67 mph, then slightly let off the throttle till you hear the exhaust note change to a kind of a whooshing sound, see if it won't hold it. My Dodge Magnum will hold mds at 75 mph btw on level highway. I got 22 mpg on a tank with my friend's Laramie. Sometimes I would slow slightly below 65 to keep it in mds, though.
Hmmm... I've only done up to 120km/h with cruise on, and the MDS stays on. I know it's on because ECO comes up on the EVIC. But on the slightest incline, it turns off - so it can be pretty sensitive, I guess.
MDS on mine seems to hold ok from 45 to 65 on flat ground, no head wind. Any head wind or overpass incline and it jumps back to 8 cylinders. I also noticed it likes a little deceleration before it goes into MDS most of the time.
A couple years ago i was returning home from either Toronto Canada or Connecticut
I had stopped by Joplin Mo. to say Hello to Stacy, (BlueJet)
i dislike Oklahoma I-44 toll roads & slow traffic because of construction that always seems to be happening there. So i took some country roads & went down through Muskogee, a beautiful drive. My MDS was on most of the time
Here is a pix, look at the temperature, speed, & mpg
That gives me hope! I'm gonna let it break in a bit longer and let the dealership look at it. What kind of mpg are you getting on the highway? 15-16 is about my average with short stretches around 17-18. The few times mds kicks in, mpg jumps up to 20-21.
Here are some pics of the mpg's on mostly flat ground and maybe 10 mph winds at 70 (some tailwind) and 55 (crosswind). MDS is on in these pics. I reset the mpg that morning, drove to work in traffic and the pics were taken at lunch on about a 25 mile stretch of highways with a couple of stop lights. To and from work it averages 14+ usually.
Oklahoma roads are the worst in the nation. When leaving the state or returning, I always know as soon as I cross the state line I'm getting close to home!
Looks like the the 6.4L could get some really good hwy mileage once this winter fuel is gone. Any one of you 6.4L owners have any good towing mpg & reports to share yet? I test drove a 2500 6.4L and didn't jump on it. I know these 6.4L's are so new yet, anything you dislike after driving them a few weeks? I thought with with 4.10's, the truck would be able to hold MDS or go into MDS easier because of the gearing. Have you ever tried downshifting a gear to help hold MDS, say from 5th to 6th? Does the MDS only work in the top gear?
It cleared itself so I'm going to let it go till the first service. The driveline seems to be loosening up more. The mpg is creeping up, as is the speed the mds is holding.......
I just did a 700km round trip on the highway... I have come to the conclusion that as soon as the RPM hit 2000, MDS turns off. I had to keep my cruise control under 105km/h in order for MDS to kick in. I averaged 13.3 litres per 100km with an avg of 80km/h speed.
I just finished a 1000 mile trip. The first leg averaged 17.5 mpg on the evic, but hand calc was 16.5 mpg. I mostly drove the speed limit (65-75) and MDS was active most of the time when speeds were below 70 mph. The return home averaged 15.5 evic and 14.5 mpg hand calc. That leg was with a strong headwind the entire time and higher speeds, so MDS was rarely on.
My truck doesn't have the ECO display. After having it on a 12' 1500, I assumed it would be on the 2500. Can't find it in any of the menus'. On a brighter note, I'm now feeling the MDS staying engaged up to 65 mph. Fuel economy is up to 18-20 mpg on the EVIC. Break in and much warmer temps are restoring my faith in the 6.4 mpg claims.......
On my 14 6.4 3.73 it has come in as early as 35mph wont hold usually though ..seems to vibrate quite a bit. I just did my first highway drive md to nj on fri 70 mph stayed on and mpg went up 2-3 mpg ... I only have 500 miles on my truck so hoping vibration isnt as noticeable when engine breaks in , truck has been getting smoother as mileage rolls on
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