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Old 07-10-2016, 10:37 PM   #31
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Ok, no I don't feel so bad - I guess towing is the main cause for gas usage


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and using cruise control ! use cruise less and you can get better mpg
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Old 07-11-2016, 02:21 PM   #32
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First time towing with Denali and have a few questions for the forum

Ok so just got back home and it was a whole different ride. This time I averaged 11.9 mpg, I had one weird rpm spike just to 4500 rpm , I rode it for about 20 seconds and then decided to tap the brakes which stops it. Since it was now my second tow with with this vehicle I felt much more comfortable and was at 70 mph, one hand - she handles really well . I even stopped at a weigh station and I'm 2000 lbs under the max gwcr so that's a good felling. This tells me I can actually upgrade my tt now .


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Old 07-11-2016, 02:44 PM   #33
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I had a 2001 1/2 ton Silverado with the 5.3 that I towed a 7000 lb TT with. I did not use the tow/haul mode in this truck as what you are feeling is the trany waiting to long to downshift and it would downshift 2 gears at once. It would not do this when not using the tow/haul mode with the 4 speed trany. The newer 6 speeds are a lot smoother on the downshifting. I always used my cruise control. To much work to not use it and keep a steady speed. No real advantage in the older trucks using the tow/haul. All it did was reprogram the shift points. Try not using it and see how you like it.
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Old 07-11-2016, 03:55 PM   #34
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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.


Hm, my trans was about 215 f for the most part, it is in the 90s out here. So maybe I need an aftermarket cooler.


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Old 07-11-2016, 10:19 PM   #35
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Hm, my trans was about 215 f for the most part, it is in the 90s out here. So maybe I need an aftermarket cooler.


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If you dont have a tranny cooler get one. easy to install.
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Old 07-11-2016, 10:19 PM   #36
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If you dont have a tranny cooler get one. easy to install.


My tv has one but wonder if I should a second ..


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Old 07-11-2016, 11:14 PM   #37
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Hm, my trans was about 215 f for the most part, it is in the 90s out here. So maybe I need an aftermarket cooler.


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i run about 160 when towing 195 when heading up the steep passes in Colorado and the west . 3 tranny coolers 2 factory and one aftermarket
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Old 07-11-2016, 11:33 PM   #38
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Ok so just got back home and it was a whole different ride. This time I averaged 11.9 mpg, I had one weird rpm spike just to 4500 rpm , I rode it for about 20 seconds and then decided to tap the brakes which stops it. Since it was now my second tow with with this vehicle I felt much more comfortable and was at 70 mph, one hand - she handles really well . I even stopped at a weigh station and I'm 2000 lbs under the max gwcr so that's a good felling. This tells me I can actually upgrade my tt now .


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Running 70 is not a good idea if you have the standard ST tires that are only rated to 65 mph.
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Old 07-12-2016, 12:19 AM   #39
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Running 70 is not a good idea if you have the standard ST tires that are only rated to 65 mph.
i agree, I just didnt realize it but when I did I would slow down.
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Old 07-12-2016, 08:47 AM   #40
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MRPEP what did you do with your van? My wife had a 1999 Chevrolet conversion van for years and loved it. We finally sold it when we ended up with her mom's Subaru Forester. It was sort of a sad day to say goodbye to that van as so much life had gone on, (and I mean hauling kids around and stuff like that), in that van. By the time we sold it, it had many miles on it and the front end steering was a little loose, (it sort of drifted around a little), but otherwise it was in great shape.
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