No, since those two businesses are not closely related in the services that you provide, they really should both be reported on their own Schedule C. This means that the business expenses will also be separated and reported on separate forms as well. So, your miles will need to be separated according to the business.
Your total mileage will be the same number for each Schedule C and your commuting mileage (if any) will also be the same number, but the business mileage will differ depending on which Schedule C you are entering at that time. That way, the business miles for each business will reduce the income from that business only.
If your two businesses had been closely related to one another in the service or product you provided, then they could have been combined into a single Schedule C and the miles could have been combined. For example, if you were driving for Uber and also making deliveries for InstaCart then you are essentially doing the same job as far as your vehicle use and expenses.
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