You want to claim the "per-mile" deduction. Unless the absolute only thing you use the vehicle for is work, and nothing else what-so-ever, claiming the actual expenses is a paperwork tracking nightmare which if audited, chances are you would lose. Stick with the per-mile deduction and you'll be fine.
Understand that your "commuting miles", which is from your primary domicile to your primary place of employment, is never under any circumstances, deductible.
You'll claim work related miles for a W-2 job under the deductions and credits tab in the Job Related Expenses section. You will need to keepa log book of all miles driven for everything - not just work. Make sure you include your odometer readings for beginning of year and end of year in that log book also.
