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Old 08-09-2016, 02:53 PM   #91
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Correct me if I am wrong, but in the owners manual for my 2008 it tells you NOTE to use cruise control if you are in town haul mode
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Old 08-09-2016, 03:05 PM   #92
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Originally Posted by Charles Allen View Post
Correct me if I am wrong, but in the owners manual for my 2008 it tells you NOTE to use cruise control if you are in town haul mode


You absolutely use cruise control and tow/haul mode together with the Allison. GM calls it Cruise Grade Braking. It's a feature that helps maintain downhill speed. Works like a charm in my 2008.


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Old 08-09-2016, 03:06 PM   #93
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Originally Posted by prestonj12 View Post
You absolutely use cruise control and tow/haul mode together with the Allison. GM calls it Cruise Grade Braking. It's a feature that helps maintain downhill speed. Works like a charm in my 2008.


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Cut and paste from the owners manual:

Cruise Grade Braking (Allison Transmission or Hydra-Matic 6-Speed Automatic Transmission)
Cruise Grade Braking assists when driving on a downhill grade. It maintains vehicle speed by automatically implementing a shift schedule that uses the engine and the transmission to slow the vehicle. Cruise Grade Braking operates while Cruise Control is engaged in Tow/Haul mode to assist in maintaining vehicle speed under loaded vehicle conditions. It utilizes vehicle acceleration and deviation from desired speed to determine the correct gear for the operating condition.
If vehicle speed is above the desired speed the transmission will downshift to slow the vehicle. If vehicle speed is near or below desired speed the trans will upshift, allowing vehicle speed to increase.
While in the Range Select Mode (RSM) mode, cruise grade braking is not available.
See Automatic Transmission Operation on page 2-28.


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Old 08-09-2016, 04:46 PM   #94
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I recently pulled our 5th wheel from flat Illinois to Gatlinburg, TN... the truck never had an issue pulling any grades with the cruise on (I did lock it in 5th gear in the hills). Downhill with cruise on and exhaust brake in the auto setting was super nice too.... the tranny will grade brake and the truck will vary the amount of closure on the turbo to maintain the set speed. Trans never exceeded 180, oil never exceeded 206, coolant never exceeded 200. I haven't added an EGT probe in the manifold yet, but post turbo EGTS didn't really increase much at all over the cruising temps.
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Old 08-10-2016, 11:59 PM   #95
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For my experience. The slower you go the better fuel mileage you'll get. Wind resistance is a mpg killer. And mpg increases exponentially as speed increases. For my truck, a 6.7 cummins, RAM with 3.42 axle, I keep it above 1500 RPM. 55 mph would be ideal as far as mpg goes but I'd get run over on the interstates. You pay dearly for speed when you are pulling a parachute. ha.
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Old 08-11-2016, 09:57 AM   #96
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The EPA being involved with is is a travesty. They shouldn't meddle in such affairs. I have the JGC EcoDiesel and easily get 25-28 mpg but if you get the same vehicle in Australia you are flirting with 50 mpg. So I ask you, is it better to get 25 mpg and save 10% on emissions or get 50 mpg? You would think that you are doing more for the environment by doubling the mileage, therefore using less fuel overall.

The Prius which everyone raves about is another scam as it's lifetime carbon footprint, from manufacture thru disposal is almost triple that of a Chevy Malibu with a six cylinder.

To think they have brainwashed these people into thinking they're helping the environment but in truth they're actually hurting it.
Excellent points.
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