I suggest you drop your miles-wide searching, and start a new one right at the door he escaped from. The sides of houses are used by some igs to hide against. Find every hole, crevice and bush he could hide in. Find ways he could have escaped under the fence, and when you find one, carefully search the other side's fence-line.
I've had a few escapes, and they were not fun. What worked best for me were two advanced iguana-keepers in my little town. On this one occasion, I called them for help. They started with the bushes near my house, and used sticks to probe around to get a better look. They found him in about 15 minutes. He had crawled under patch of blackberry canes, holding stock still. I had already searched that side of my house four times, and I missed him every time, though he was virtually out in the open. I still do that, as in looking for my wallet with no luck, while it was in full view.
One traveled about 30 yards, across lawns and yards, until a small crowd gathered,, thinking he was obviously very dangerous. Luckily a young lady who knew abut iguanas stooped and picked him up without a fuss. She saved me a lot of work.
They are very hard to find in large closets and crowded garages.
Blizzard your neighborhood with hand-outs about your ig and how much you love him. I know it's tiring and boring walking to the front door of every house on the streets, and you have two streets to leaflet.
If there are lots of kids near you, they are a very good source of information about what's going on in their neighborhood.
Once I found an escaped Pionus (type of parrot) in my Camphor tree. He was making a real racket. Since he had picked to land about 6 feet up, and was obscured by the thick bunches of leaves on it, I decided to walk carefully and slowly over to him. He wanted to be rescued. He stood on my finger, and with my other hand over his back, and walked around until a group of kids recognized him so I could take him home.