Hi to all. 

Maybe this is a question that many of you have, and I am one of them.

The clients do not know exactly how many miles they have driven for deliveries with Amazon and Walmart so on.

Additionally, they have worked with Uber and Lyft, but there is no issue with mileage for those, as it is recorded in their reports.

The problem is with these types of delivery services where the mileage is not clearly documented.

What do you think should be done? Since on Sch C asks:  Do you have evidence to support your deduction?

Really appreciate any insight into my following question.