Can i total my vehicles expenses for 3 different businesses or do I do each individually?

[RobertB4444]

You should do each individually.  The IRS - in reviewing your business - wants to see expenses that are associated with earning that particular income.  So you should separate the mileage out.

This is also useful for you to see which businesses are requiring the most driving and whether that is worth it in the long run.

@vanessa-reon