[vidarh]

If you're predictable enough, it might be worth it to simply arrive a minute or two ahead of schedule.

The raving reviews you'd get the first times people order a car and are told instantly "your car is already waiting right outside your door" would be rather interesting.

Get in, and your favorite radio station or music is playing.

And for colder climates: Your car is already pre-heated. I remember too many winter mornings during winter in Norway when even ensuring our car would actually start in the morning was an annoyance (even with a garage, space heaters in the garage or motor heaters is sometimes necessary).