He's been found. Just checked again outside late tonight, and he's been home this whole time. Found him sitting under the car in the backyard, again. I was afraid he jumped up in that hole where cats can get under the car hood under the front grill thing. Put some food on the porch and whistled for him. He ran up to the porch and ate and he is very happy and energetic, tail all straight up and curved forward. Just glad he is safe because he went missing for a day and I was really stressed.