Growing up, mom went grocery shopping once every 2 weeks. We'd load up 2 or 3 shopping carts that filled 8 or 10 grocery bags.
One auto trip every 2 weeks for groceries.
With all the delivery services for restaurants, groceries, and more and more sundries, the trips to my house are made for less and less 'stuff' per trip. More trips per household obviously means more gasoline burned.
With Amazon or FedEx, at least it's a truck on a route with several dozen deliveries to make. But this Uber/Lyft scheme looks to likely be 1, maybe 2, deliveries per trip.