Normally, when you deduct mileage, there is a depreciation equivalent built into that mileage rate. it fluctuates each year and IRS posts a depreciation equivalent mileage table that goes back several years. Have you used this for business between 2001-2015?
Please read page 24 of this IRS link, that give you the Rate of Depreciation Allowed in Standard Mileage Rate. You can multiply the total mileages times the depreciation rate to give you the depreciation for that year. Then you add up all of the totals to determine your total depreciation used during those years for your business.
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