Put out a wildlife camera on the porch, and finally got two good shots of this guy:
aha he's a grey torotoise shell mix, with the appetite of a wolverine. Trouble is, its getting colder, and by my calculations canned cat food freezes solid within a half hour at 20 degrees.
He won't come in. If I appear in the doorway he quietly jumps off the porch and hides. Or goes back to his possible home under the barn.
Just keep on keepin on, I guess.