Yes, tracking mileage is required.
Q. Is tracking it required on the 1099-K?
A. No. That is, there's no line on form 1099-K for mileage. Whether Doordash requires you to report your mileage to them is between you and DoorDash and not a tax question. Even if you do, Doordash is not going to report it on form 1099-k.
The IRS requires two things:
1. It requires you to report all your expenses. It is not optional that you can omit expenses so that your income will be bigger so you can get more Earned Income Credit.
2. You must keep a contemporaneous mileage log to track and document your mileage.
So, yes, tracking it required.
