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post #1 of 21 (permalink) Old 12-28-2005, 08:09 AM Thread Starter
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Multidisplacement engine

I've been reading some of the gas milage you guys are getting out of your 5.7s. Not that I really care much about gas milage...if I wanted good milage I would NOT be getting a Commander. BUT, the salesman said the MDE gives you 20% better gas milage than other v-8s...and the sales literature claims 15% better mpg. This does not seem to be the case at all. It seems that the 5.7L engine gets the same average milage as any other v-8. I have an 01 F-150 SC 4x4 with a 5.4l v-8, it gets 14 to 18mpg depending.. my father in law has an 05 F-150 4x2 with the 5.4l (also claimed to be get slightly better milage)..not true as it gets the same as my truck. (granted I have 3:55 gears..doesnt the Commander have 3:73 with the Hemi?)
I wonder why Jeep/CDX claims 15% better milage but its totally untrue? Its just a pet peeve of mine and it gets on my nerves..
I wonder if they are so desperate to sell their v-8s in a high gas price world that manufacturers will claim anything to do it?

Also how does this work? The sales lit says MDE is only activated between 40-60 mph....our salesman says MDE is in effect when cruising at any speed and all 8 cylinders are getting gas ONLY when you accelerate???
Whats the deal? How does it work for real?
LOL...it would be nice to know..right now I get conflicting reports.
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post #2 of 21 (permalink) Old 12-28-2005, 02:16 PM
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Re: Multidisplacement engine

You should realize where the salesmen get information - they get it in the car brochure. There is no "secret informational source" just for salesmen.
The brochure specifies 40-60 mph is when Hemi switches from 8 to 4 and quoted mileage savings are up to 15% depending on your driving habits. From the test data I read it is about 1mpg better.
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post #3 of 21 (permalink) Old 12-28-2005, 05:48 PM Thread Starter
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Re: Multidisplacement engine

LOL If the salesmen get their info from the car literature why does he tell me its gets 20% better mpg when the literature clearly says 15% better? (besides 15% better would only be true if you are running the motor on a stand, not in an actual vehicle..in a totally controlled environment. actually I dont think it gets even 1mpg better, it really seems to get about the same mpg as any other V-8) In an actual vehicle, under real driving environments, MDE doesnt make a bit of difference.

The literature does specify that multidisplacement takes place between 40-60 mph...my salesman tells me that only 4 cylinders are working (getting fuel) at any speed as long as the throttle is steady, or just cruising along down the highway.....he said it only kicks to 8 cylinders when you accelerate...HMMMMM?
SO...if multidisplacement function only works from 40-60 mph..that means that the engine is not running on 4 cylinders very often...who drives down the hwy at 60mph?
And when youre drivig in the city, I guess you are within that speed range alot but you also have to accelerate alot...so its no wonder that the Hemi with the MDE feature averages 13mpg in town. I REALLY like the Commander but I'm not sold one bit on the Multidisplacement feature as being a viable and usefull fuel saving advantage. I think its a gimmick personally...made to help sell this SUV. Its the only feature on this vehicle I find suspect.

Last edited by Daytomann; 12-28-2005 at 05:51 PM.
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post #4 of 21 (permalink) Old 12-28-2005, 06:22 PM
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Re: Multidisplacement engine

well, of course the question is, 15% better than _what_??

When reading the literature I just assumed it meant 15% better than what it would get _without_ the fuel-saving system.

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post #5 of 21 (permalink) Old 12-28-2005, 07:46 PM Thread Starter
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Re: Multidisplacement engine

I just happen to have the literature right here...it says:
"When the MDS feature activates at 40-60 mph, four of the engine's eight cylinders deactivate, for a fuel savings of up to 15 percent* over the other V8 engines."
"*15 city/19hwy EPA estimated mpg. 12 to 15 percent improvement depending on driving conditions."

LOL! I just think that this is stretching the facts quite a bit...well ALOT! LOL
I still think MDS is a gimmick and is great fodder for adspeak B.S.....It doesnt offer any savings.

I'm not dogging the vehicle...just their marketing ploy by using MDS as a fuel saving feature.
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post #6 of 21 (permalink) Old 12-28-2005, 09:20 PM
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Re: Multidisplacement engine

Well, you just said it. Considering the very small range of speeds (40-60) where MDS switch takes over, the MPG saving potential seems limited. Let's say, I am decending for 8 miles from Snowbird to Salt Lake - 8 miles total and you cannot go over 35 mph or you go into the canyon. You don't push the gas at all. According to the brochure 8 cylinders will be firing. Most of the driving in the city is done at 40 or less mph and highway is always over 60.

Considering the fact that 5.7 Hemi can only be had on Commanders with MSRP of 42,800 or more while totally loaded standard car with 4.7V8 goes for 36K (package 28U is a must), $7000 is money bad spent to get more power and 0 to 0.5 mpg savings. I don't think there will be 1 mph saving. Oh, the 7000 will also buy you woodgrain panel and some misc. junk - big deal!

Bottom Line - my research is done. I've got myself a 4.7 V8 and that''s it.
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post #7 of 21 (permalink) Old 12-28-2005, 09:29 PM
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Re: Multidisplacement engine

I agree with mikey, 4.7
Hemi's are really cool though.
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post #8 of 21 (permalink) Old 12-29-2005, 06:54 AM
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Cool Re: Multidisplacement engine

I love my Hemi. Powerful engine is just one of the things I must have. I don't haul I just have a need for speed.
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post #9 of 21 (permalink) Old 12-29-2005, 08:06 AM Thread Starter
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Re: Multidisplacement engine

In reality, I could care less about gas saving, thats not what I buying this for. I gotta have that Hemi....it really runs great, all the other goodies is just a plus. It has put every other SUV we've driven to shame. But I am now at ease since I got to vent about the dumb ass claims made about MDS. Things like that just get on my nerves...LOL

FWIW..even with ALL the options, this vehicle is a bargain compared to what other comparably equiped SUVs go for. Hell, the one we are looking at, which is loaded to the gills, is $9000 less on the MSRP than the LR3 we were looking to get....AND the Jeep has MORE options than the Land Rover LR3 we were going to get. Cant hardly beat a deal like that.
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post #10 of 21 (permalink) Old 12-29-2005, 11:47 AM
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Wink Re: Multidisplacement engine

I have the Multidisplacement Hemi and I can't say that it saves much gas over my last Hemi. The engine was in a Durango though. I am like most other Hemi owners and don't really care about the MPG. I have been told I have heavy foot. They can eat my dust all 5.7L of it!
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