yea just get a tuner and disable it. you will get better mpgs along with way better shifting. Also more power

 

I have an 06 and i averaged close to 16-18 before the tuner. You have to remember mds only help over 60-65

 

So how do i tell that MDS is turned on - car feels slugish?

 

Ok guys, thanks a lot. Your info is very helpful.

I'm picking up superchip tomorrow, so we will see what it does for me.

Also thanks on MDS info, I kinda had idea how it worked, but I thought it would turn on even under 60 mph, when your foot is not on the gas

 

No it's only on over 60-65. Since your momentum is great, it takes very little force to keep the truck going. So it shuts down to a 4cyl

 

What, no way! i think Chrysler claims it kicks on after 30mph, but mine kicked in even at 20mph. It just depends on your driving style if it kicks in sooner or later.

MDS definatley doesn't help over 65mph. On perfectly flat ground with zero head wind, my truck slowed down everytime MDS kicked in at any speed and especially more so after 65mph.
I have an AT3030 muffler with no resonators, so I'm 100% positive when it kicks in due to the helicpoter pulsating sound.

 

Those computers aren't very accurate. Mine says 24 mpg at 55 mph on the highway.

Is the truck a single or quad cab, lifted, any mods? How heavy is your foot?

Those numbers seem low since I have almost the same truck. Mine has an Airaid CAI and mixed city and highway driving I can get about 440 miles to a tank (completely empty). Averages out to be about 17.5 mpg mixed.

 

Alright now I'm confused. I goggled it and found a few articles stating it kicks over 65, and a few saying it's under 65. Anyone know?

I was under the impression it didn't need the full power of a v8 at highway speeds. Either way, you will notice mpg improvements by disabling it with a tuner

 

It kicks in under light throttle in as low as 2nd gear. If the load on the engine is under a certain predetermined percentage of available power, it will come on. It works best at speeds of 55 or less. On an incline when using cruise, it will usually kick in and out.
I don't mind the MDS part, I do not like that when the MDS is activated, the lock up clutch in the transmission torque converter slips @ about 30%. This is why the rpms will raise when MDS kicks in. Unneeded wear on the transmission in my opinion.

As for the overhead, it calculates an average. I usually reset mine when I fill up. Then at the next fill-up, I do the math and it is usually within a couple of 10ths of the overhead computer. Constantly resetting it on a tank will give false reading.
Yes it is beneficial under the right conditions.
My trip to work consist of 65 and 70mph speed limits and is hilly, so it didn't help me a whole lot.

On a trip on flat land, it got 19.7mpg before the Predator and no MDS @ 65mpg.

 

Actually my truck is exactly the same as yours.

No mods on mine at all


Lxman1:

I do reset the computer only once, after I fill up, I do not reset it while driving on that same tank. But mine overhead computer reads way off