Since May, the Tahoe has been used sparingly. The only time I drive it is to get building supplies or carry the dog on an infrequent visit to the kennel/vet.
These have been quick out and back runs for the most part and I never added the Tahoe keys to the TCH key ring.

Today, I took it (the Tahoe) to Nashville (delivery, setting up my wife's booth at a holiday gift fair, shopping and restaurant) for an extended drive.

Unlocking, starting and re-locking manually with standard car keys are no longer automatic subconsious actions. I forget to pull the keys out of my pocket, remember, unlock, put them back in my pocket and get in before realizing I can't start the thing.

After stopping, the problem is reversed -- what did I do with my keys?

My appreciation for the TCH lock and key system has increased after only one day without it.