property tax portion vehicle

The company I contract with is reimbursing for business miles driven--but not counting it as income (not issuing a 1099 misc they used to report it as income on a 1099 misc) so i cannot write off mileage expense  . I would think i could still write off part of the personal property tax since its not commuting miles, However using the step by step questions in turbo tax I have to enter the miles as commuting so it does not calculate a write off for them Can I change this on the work sheet and somehow note they are not commuting miles (but 67 cents per mile reimbursed by the company I contract with

The vehicle is used about 80 percent for the business miles

Can I enter 80 percent of the property tax as a deduction manually on the forms or under misc expenses?