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					Originally Posted by  aluisscp
					 
				 
				Thanks for your answers, I guess if I want to use this feature I'll have to turn to epubs. 
			
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 The stock available space on the screen for reading purposes  on the Kobo Glo (6") is:
kepubs: 74,522% (4.47 inch)
epub: 90,527% (5.43 inch)
The rest of the screen is taken by a fixed header (kepub) and/or footer (both formats) and/or left and right page margins (kepub) which can not be altered by the user.
This is probably not much different for other Kobo ereaders.
You can only increase this using the Patcher.