I did a little bit of Postmates for a while, and tracked how much I was making per trip. This sheet is PM-centric, but can be altered to work for the other delivery services.
Track you location and mileage. For each delivery, enter the mileage, and copy the payment data from your PM screens.
The sheet will total the profit (or loss) per trip. Using this, you’ll learn how to avoid taking “money loser” orders.
The sheet has colors, but I added those myself.