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My manual says 89 is the recommended fuel so thats what I use.
Mine too, though it also says 87 is acceptable so long as there are no symptoms of a performance problem. Having experimented, the truck seems perfectly happy with 87, at any altitude, so that's what we run.
 

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I've been towing a 10k lbs camper while using nothing but 87 octane and I've had zero problems with it. No spark knock, nothing.
 
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