Gemini also suggests driving. I followed up with:

"How short would the distance need to be for me to prefer walking?"

The answer included (paraphrasing for succinctness):

* Technically 0 because otherwise "the car is technically in a different location than the car wash."

* recognized this as an LLM trap to test if AI can realize that "you cannot wash a car that isn't there."

* Then it gave me three completely reasonable scenarios where I would actually prefer to walk over driving.