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post #11 of 21 (permalink) Old 04-09-2019, 02:20 PM
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392/A8 cruising at 72 mph

28 mpg with MDS

24 mpg without

So it's worth 4 mpg for me. I will say that about 72 is about as fast as it will go and remain in MDS, above that speed or in a headwind it won't hold it and will kick out, still not bad mpg for a 392.

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post #12 of 21 (permalink) Old 04-10-2019, 01:28 AM Thread Starter
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Quote:
Originally Posted by Slidd View Post
392/A8 cruising at 72 mph

28 mpg with MDS

24 mpg without

So it's worth 4 mpg for me. I will say that about 72 is about as fast as it will go and remain in MDS, above that speed or in a headwind it won't hold it and will kick out, still not bad mpg for a 392.

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The MDS MPGs I referenced in my first post were calculated on a trip to Atlanta and back. That number should be about as representative of real-life expectations for me and my car as there is. But the non-MDS MPGs I referenced was taken over a much smaller sample size - during a trip out of town that spanned less than 500 miles (a smidge over 400 actually). Plus that trip included some fairly uncommon scenarios that would have all combined to lower my non-MDS MPGs (extended idle times, extended 1st & 2nd gear driving on winding back-roads due to a fog-induced detour, a couple extended runs up to and cruising at 120 mph, etc.).

In fact, I wouldn't be surprised if I could have come close to matching the MDS MPGs during this non-MDS trip if the weather had been clear and I were able to (and wanted to, which I don't) hyper-mile it. Which, if true, doesn't cast the MDS tech in a very favorable light IMHO.

IDK, like @Rockster said, it's all about the cumulative numbers that the manufacturer can claim over a fleet of vehicles so they are considered to be within spec for the CARB and CAFE requirements...I guess I have just been (subconsciously) considering MDS something of a black-magic, voodoo, wonder-thing that could help a stump puller get the MPGs of a SMART car at the flip of a switch (or actuation of a solenoid, etc.), but that's just not realistic or reasonable to expect of technology in such an early stage.

Maybe in 20 years the Hemi can go all Prius with just a thought, but not yet, and I'm actually just fine with that.

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post #13 of 21 (permalink) Old 04-10-2019, 02:06 AM
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I think it is worth noting that the 392 or 6.4 litre on 4 cyl is still 3.2 litres, where I live it is still a larger displacement than most of the other cars on the road!

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post #14 of 21 (permalink) Old 04-10-2019, 06:55 AM
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Quote:
Originally Posted by Slidd View Post
392/A8 cruising at 72 mph

28 mpg with MDS

24 mpg without

So it's worth 4 mpg for me. I will say that about 72 is about as fast as it will go and remain in MDS, above that speed or in a headwind it won't hold it and will kick out, still not bad mpg for a 392.

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I wish mine would come on at 45 and kick off before 75 like it used to. After my TC failure they did some sort of PCM flash. Now it's on by 40 and doesn't turn off even at 80. After 75 it sounds like a bag of shit, I can't stand it. I'll live with the slightly lower mpg and keep all 8 all the time.

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post #15 of 21 (permalink) Old 04-10-2019, 08:33 AM
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I wish mine would come on at 45 and kick off before 75 like it used to. After my TC failure they did some sort of PCM flash. Now it's on by 40 and doesn't turn off even at 80. After 75 it sounds like a bag of shit, I can't stand it. I'll live with the slightly lower mpg and keep all 8 all the time.
If you had HP tuners, you could tweak MDS operation. Doesn't look like the chargers (and challengers) have everything mapped out as I think certain models even allow changes to MDS solenoid operation.
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post #16 of 21 (permalink) Old 04-10-2019, 09:39 AM
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If you had HP tuners, you could tweak MDS operation. Doesn't look like the chargers have everything mapped out as I think certain models even allow changes to MDS solenoid operation.

Hmmmm, maybe time to update my old Predator tuner to this one.
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post #17 of 21 (permalink) Old 04-10-2019, 03:10 PM
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My work commute is 40 miles one way, probably 20% in town, 80% highway with a 60 mph limit, and about a dozen stop signs/lights. In Sport mode with no MDS I average 22, about 24.5 with MDS on. Needless to say, I keep it turned off.

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post #18 of 21 (permalink) Old 04-11-2019, 01:19 PM Thread Starter
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Quote:
Originally Posted by ChallyTatum View Post
If you had HP tuners, you could tweak MDS operation. Doesn't look like the chargers (and challengers) have everything mapped out as I think certain models even allow changes to MDS solenoid operation.
And if my aunt had wings, she wouldn't bump her ass when she turned into my uncle...or flew with my uncle...or went to the sock hop with him?

Wait, what???

STOP TRYING TO CONFUSE ME!
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post #19 of 21 (permalink) Old 04-11-2019, 02:20 PM
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And if my aunt had wings, she wouldn't bump her ass when she turned into my uncle...
But if she had too many wings (mmm wings)...wouldn't it cause her ass to get bigger?
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post #20 of 21 (permalink) Old 04-11-2019, 02:40 PM Thread Starter
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[QUOTE=ChallyTatum;8456353]But if she had too many wings (mmm wings)...wouldn't it cause her ass to get bigger?
.../QUOTE]

That don't make no damned sense!

Unless you're trying to be funny...hey, I got a funny story, it involves a guy getting stopped for going all WOT coming out of a side street:

----------------------------------------

Local LEO: "Is there a medical reason causing you to drive like that?"

Nuke: "Couldn’t breath."

Local LEO: "You can't breath?"

Nuke: "I can now, but I couldn’t earlier.

Local LEO: "How does driving like a bat out of hell help your breathing?"

Nuke: "For me, a day without WOT is like a day without oxygen."

Local LEO: "Uh-huh. And what does getting arrested for reckless driving do for your breathing?"

Nuke: "Makes it harder."

Local LEO: "Then SLOW DOWN!!"

Nuke: "Yes sir, I will sir."

Local LEO: "Outstanding. Now sit tight, I'll be back in a minute."

Nuke: "Officer, Is there any way I'm leaving here without a ticket?"

Local Leo: "Don’t hold your breath…."
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