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Old 07-09-2016, 06:38 AM   #11
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Got it , thanks guys - just seemed kind of weird cause I didn't get this with my van but then again I am hauling much more weight now Adays.


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Old 07-09-2016, 06:49 AM   #12
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Your tow vehicle is performing exactly like it should. If it did not shift down to a lower gear which cause's the RPM's to rise, the engine would lug and the transmission would be in the incorrect gear causing excessive heat which is your transmission's worst enemy! Just enjoy and let the electronic "brain" in the transmission do it's thing, it's designed to keep the engine and transmission in sync, don't try to out guess it!
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Old 07-09-2016, 07:00 AM   #13
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Ok thanks , I actually thought the electronic brain was on drugs when it did this , lol - also, I swear I could see the gas needle drop when it revved that high, lol


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Old 07-09-2016, 07:41 AM   #14
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We would still like to know the answer to MillerTime's question: what year is your Yukon Denali?

Those 6.0L engines are known to burn some gas. My son has one in a Yukon Denali. His username on another forum is Gasguzzler!
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Old 07-09-2016, 08:45 AM   #15
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2003 and when towing I used 7.5 mpg


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Old 07-09-2016, 08:51 AM   #16
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Quote:
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2003 and when towing I used 7.5 mpg


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Our son's unit is also a 2003.
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Old 07-09-2016, 09:12 AM   #17
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Quote:
Originally Posted by mrpep View Post
2003 and when towing I used 7.5 mpg


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Quote:
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Our son's unit is also a 2003.
I think alot of those Denali's were all-wheel-drive back then. That will contribute to the lessened mpg.

I bought an escalade wrecked a few weeks ago, i think its a 2002 or 2003 with the HO. 6.0. Its Awd and i only drove it around 50 miles home.
The DIC showed it got 14.5 mpg with aftermarket exhaust on it and empty. I did notice it shifting alot, but i thought it was due to reduced back pressure from the aftermarket exhaust . I already have a stock muffler to put back on it to try to regain the back pressure needed to keep it in the torque area a little better w/o shifting all the time.
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Old 07-09-2016, 09:42 AM   #18
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I get 14.5 in town as well , it's just towing and I just bought this specifically for towing , lol


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Old 07-09-2016, 11:33 AM   #19
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Completely normal! It'll eat gas when it downshifts and holds higher rpms. Seems like it's doing what it's supposed to. Mpgs seem right. Maybe not the best TV but it'll do.
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Old 07-09-2016, 02:15 PM   #20
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You should actually try to leave it in the high RPM gear the whole time and not let her shift so much. My Denali has a manual shift capability and I leave it in a single gear on hills.

You should have a digital readout of your transmission temperature. You will notice that it stays cooler when you are running higher RPMs.

You need to keep that transmission temperature below 200 degrees. With lower RPMs you are probably not getting a full converter lock on your transmission and the clutch may slip under load.

That 6.0 L engine is designed to operate at 4000 RPM with no problem. Your transmission is not capable of operating above 200 degrees without damage.
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