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On flat land I virtually never use it.
I only use it on slight grades when the transmission seems to be hunting for gears, even when towing. I get better gas mileage without it on.
For obvious steeper grades I will turn it on, as it saves the brakes, as other have mentioned.
The feature really shines when you're going downhill on a significant grade while towing. The transmission will automatically downshift and help you maintain a safe speed without using your brakes.
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