The business use is calculated by dividing total miles by business miles, then multiplied by months used for business divided by 12, so 27% business use is correct.
Since you stopped using the vehicle for business half way through the year, you would only be entitled to the business use % for your expenses too.
You could try using Standard Mileage this year to see if you get a better vehicle expense deduction.
Here's more info on Business Use of Car.
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