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					Originally Posted by  Dean
					 
				 
				At our altitude, it is not likely to do much of anything except rob power IMHO. And as long as your tune has not disabled them, there are reasonable safeguards built into the ECU to protect you from detonation. 
			
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 Dean, the ecu will prevent your motor from suffering damage if detonation actually happens. A slight octane boost, while less necessary at altitude, will prevent detonation in the first place (unless you have serious issues elsewhere).