Originally Posted by blackpearldodge
One more thing; nice truck. Really nice colour!
Thank You. I think I'll change to 'your' colour with my next Ram.
Originally Posted by Dortmunder
From what I've read the ECO mode does not really have anything to do with MDS.
Seems like a lot of people think that because "ECO" is displayed then the trucks MDS is active, or whatever.
From what I understand it's just there to show you that you're "driving in a fuel economically correct way". You'll notice if it's in ECO mode and you give it just a little bit too much gas, it will drop it, let off a little and it will show again.
Basically as long as you aren't accelerating too fast it will show ECO. Or if your foot is off the gas altogether.
I could be wrong, but that's what I gathered from reading the manual and looking around online
Originally Posted by snrusnak
^ I believe that's true....but basically if you're on the freeway at normal speeds, and the ECO is on, then MDS is probably on...
That is true. ECO does 'NOT' mean MDS. ECO only means that you are satisfying the computer's algorithm for 'Driving in a fuel efficient fashion'.
MDS on the other hand, requires the engine to be operating at very low load. When you drop 1/2 the cylinders, you have less then 1/2 the power, so the remaining cylinders require a lot more fuel to 'carry the load'. Theoretically, the added fuel is less then double that required (per active cylinder) in 8 cyl mode.....theoretically....
If the load on the engine is low enough to enter MDS mode, it has already satisfied ECO mode, so the light is already on.
In a nutshell -
You can have ECO without MDS, but not the other way. Before you can satisfy the MDS requirement, you have to have already satisfied the ECO requirement....it's not as strict.
Prior to getting my tuner (by which I have disabled MDS), I often noticed the ECO light when driving on the highway, but very, very seldom, did it ever go into MDS mode, and when it did, it was very short lived.
For some, MDS has proven to increase fuel mileage....that is not the scenario I witnessed with my truck....with my driving style.