My Allison book says to use it on flat to rolling hills, with cruise control for better fuel economy. I don't have my Allison manual with me but found this on their website and copied a warning from my coach manual (have that on hard drive).
If you need more info I will be back to the coach in a week or so, I could copy some of it for you. Mine is the 6 speed version.
From Allison's website:
http://www.allisontransmission.com/s...p?CategoryID=4
From coach manual:
CAUTION DO NOT use Economy Mode in heavy stop and go traffic or mountainous terrains. Frequent shifting while using heavy throttle occurs in Economy Mode and increases transmission fluid temperature. Exit Economy Mode until road conditions improve.
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2009 Safari Cheetah 40 SKQ