Yeah, key question on the cover type. I was just away for 12 days and my autocover was closed (so opaque). My FC went up 1.5 with my SWG running and it was generating .3 PPM of FC per day. Normal FC usage is 1.5 per day max which is on the low side. So my actual usage was about .2 per day. I was nervous about setting it that low but previous year's experience of setting it too high told me it should be ok. Just a data point in the discussion.