Deductions & credits

Thank you for the information. But I’m still confused with TurboTax. Basically I drove 220k miles over 5 years and the mileages varied every years. And I used standard mileage deduction. 

I purchased it in August 2015 for $38000 and sold it for $6000 in September 2020. 220k miles on the clock. Can you give me a formula or a calculation method. Thanks