I've known you can't use traditional Duraflame logs in a stove/insert but lately I'm seeing a commercial for newer ones that are free of petroleums and 'environmentally friendly'----anybody have the poop on these, as in are they supposedly safe for woodstoves now? I'm just curious because I'm pretty sure my wood supply won't last through Spring (if it ever comes) and I'm not finding BioBricks/Prestos or anything similar 'round these parts.