Hi Rasca43
Sorry to hear that your cat is missing. It's very dificult to know just what may have happened. Lets not think about the bad stuff and focus on the possibility that he has gone a territory mission and just wandered a little too far and now is finding it difficult to find his way home.
Our cat once did this, and turned up covered in dirt and looking as if nothing had happened. So keep your chin up and post signs around on lamp posts etc (even if it is a mile away or so) and if your council has an environemental dept it may be worth contacting them as sometimes they have animal wardens who may have come across your cat. You never know it could be worth a call.
I hope it all works out fine for you.
ttilmo