Vehicles can get tricky. You can use a different method for each vehicle. However, if you ever want to take the Standard Mileage rate deduction, it must be done in the first year the vehicle is placed into service. After that, you can choose between the Actual Expenses or the Standard Mileage rate.
Keep in mind that you have to track mileage no matter what method you use. It sounds like you already do this. But, be sure to keep good records in case you are ever required to provide proof to the IRS. The reason to keep track is to get the business use percentage for each vehicle. The IRS assumes that it is likely that most taxpayers use their vehicles for personal use from time to time.
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