Hello Wayne, my kings are all eating rats. I have had my female Florida king for 7 years. She is not a regular eater sometimes going a couple of weeks without showing interest in eating. To be honest I don't have a "regular" feeding schedule. I feed when my snakes start roaming,I let them tell me when they are ready to eat. This was not really an answer to your question but just letting you know that each snake is an indivual. As long as your snake is not too fat or too thin it is probably fine on your schedule. A medium rat is a nice size meal for a kingsnake(IMHO). At that age the growth has probably slowed down quite a bit.
Miller
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0.1Florida King
1.1 Eastern Kings
1.0 Black Milksnake
1.0 Chow Chow (2003 Papi)
0.1 Cats (Shug)