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Once you go to actual expenses you can’t go back to standard mileage. See here. 

https://www.irs.gov/taxtopics/tc510

 

. However, if you used the standard mileage rate in the year you place the car in service and change to the actual expense method in a later year and before your car is fully depreciated, you must use straight-line depreciation over the estimated remaining useful life of the car.