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Hi there, @user09759.
Thank you for reaching out to the Community. I'll help you modify the mileage you've entered manually. I'll show you how:
Once you edit the mileage, it will also automatically calculate your Tax deduction.
I've included an article that helps you about methods to deduct the cost of operating your vehicles: About auto, car, or vehicle deductions
You can always find me here if you need more help in modifying your mileage. As always, assistance is just a post away. Have a great day!