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KF8 is basically the same as EPUB. So by converting to KF8 you will preserve any advanced formatting. This is useful for the future even if you do not have any devices currently capable of reading KF8. The KF8 MOBI file should work exactly the same as the old MOBI file on your current devices, so there is no downside to generating KF8 (apart from a little extra storage space to store the larger file).
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