The variations in basis and depreciation each year are affected by what you enter for personal and business mileage driven each year. The more business miles versus personal, the larger the depreciable basis and resultant depreciation.
I suggest you edit your business entries and on the screen that says Your (name of business) Business, choose Business Expenses, then Business Vehicle Expense menu options. Then, choose the option to update your business vehicle entry. You will come to a screen that asks you how you want to enter your vehicle mileage. You need to enter your total mileage, the mileage driven for business and your commuting miles. Your depreciation deduction will be dependent on how many miles you drove for business versus personal.
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