great motor, naturally a little thirstier than the the smaller 5.3. but with a load not working as hard.  is that what is in the Avalanche your looking at?  i know that is not as thirsty as the dodge 5.9.  considering your limited useage, it would not be much of a factor.  the gear ratio would be a factor also..
		 
		
		
		
		
		
		
		
		
	
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