'll bite and argue the other way based on dinners needing a cab so as not to drink and drive
If that is the case now you have less trips.
You could cab from the airport and stop for groceries on the way
If you want a shopping day, either a cab or depending when your flight leaves, we shopped on the way to airport. That would nean 2 cab rides plus whatever was needed for dinner. Again assuming you would cab for dinner, 2 cab trips would be cheaper than a car

All depends on what you need

If you cab, suggest you arrange with Wilfred Brooks

J&B