I've only used Coleman fuel (white gas) in my MSR stoves (including dragonfly).  However, I always use a fine screen filter funnel to fill the fuel bottles.  

My guess is most clogs for MSR stoves are a consequence of contaminants on the pump while transporting or rigging to burn and not directly from the fuel source.  I really need to start carrying the pump in its own "clean" bag that is added to the other stove components for transport.

dd