Heat log usage and storage

I'm tconsidering using heat logs (alongside the kiln dried logs I currently use if needed) to reduce cost.



1. This only really works if I buy a decent quantity - a pallet at a time - to keep the cost down. A pallet may end up lasting a couple of years if I end up mixing them with real logs to get a decent fire. Providing I keep them dry (which I can do easily enough by sealing next years supply in polythene and keeping them in a decent brick garage) will they last this long or do they deteriorate in storage?


2. Do you tend to mix heat logs with "real" logs or do you use them on their own?


Apologies if this has been answered before - have tried various searches but can't find the answers.


Thanks!