"I need the car for after"

There's an objection that sounds like logistics and mostly isn't. The shop is half a mile away, yes, but after the shop you're going on to the school, and after the school to the thing across town, so the car has to come out anyway, and once it's out you may as well use it for the shop.

Look at the chain. The shop is inside the circle. The school is inside the circle. The thing across town isn't. That's one trip that needs the car and two that don't, and the default has bundled all three into "the car's out anyway". The honest version is that you walk to the shop, walk to the school, come home, and then take the car across town. The car was going to do one trip. The chain made it do three.

"The car's already out" is the default's best trick, and it's worth seeing it as one. Once you're in the driving seat, every stop on the way becomes a car stop, because getting out and walking from a car you're already in feels absurd. So the chain gets planned around the car from the start, and the trips inside the circle get swallowed. The fix is to plan the chain the other way round. Which of these needs the car? That one. Do the rest on foot, before or after, and take the car out for the one.

Sometimes the chain genuinely can't be split. The shop, the school and the thing across town are all at four o'clock and the child can't wait. Then the car does all three and you say so out loud, and that's the rule working. But count how often that's true against how often "the car's out anyway" was the whole reason. The list from chapter 1 will show you. Most chains, in my experience, come apart into two short walks and one drive, and the walks are the ones that were being lost.

There's a version of this at work. The meeting is across the road, and afterwards you're going to the site, so you drive to the meeting. The meeting is a hundred yards away. Walk to the meeting, walk back, and then drive to the site. The parking rule in chapter 20 helps here too, because the far end of the car park puts a walk into the site trip that the chain would otherwise have taken out.