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		#1 | 
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				AZW3 vs KF8
			 
			
			
			I just updated to Calibre 0.8.65. I have a Kindle Touch and usually output AZW3 format for it.  
		
	
		
		
		
		
		
		
		
		
		
		
	
	My question: What's the difference between AZW3 output which I have been using and MOBI output using the "new" setting which I understand produces KF8 format. I thought AZW3 output was KF8 but there is quite a size difference between the two. Is there any advantage in using one over the other?  | 
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		#2 | 
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			There is no difference as far as calibre is concerned. But, I would suggest you stick with azw3, since that is what amazon seems to prefer for kf8 books.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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		#3 | 
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			Then why is there a difference in size when I produce azw3 and MOBI/new formats from the same source?
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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		#4 | 
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			 creator of calibre 
			
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			Is there a difference in size when you view them using the calibre viewer?
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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		#5 | 
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			No! my bad!! I had the wrong setting: MOBI/both instead of MOBI/new. Sorry for wasting your time.  
		
	
		
		
		
		
		
		
		
		
		
		
	
	Calibre is a great piece of software! Thank you for all the work you have done on it. Warm regards, Bruce Hoyt  | 
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