I want to make my cartos last as long as possible due to a tight budget. I would think that running them dry would tend to fry the wicks and otherwise bad things. I notice that when mine gets a bit under half full I start worrying about it and tend to refill it soon. Here's an example.

To me I think that it's time to refill. Do you all run yours right down to the bottom? This is a CE4 by the way.

To me I think that it's time to refill. Do you all run yours right down to the bottom? This is a CE4 by the way.