If the company is paying you through the Form W-2, you cannot deduct your mileage/gas expenses; those expenses have been eliminated for the tax year 2018, unfortunately.
However, if you are in fact hired as an independent contractor and are paid through Form 1099-MISC, you are considered self-employed and you would have to file as such. If that's the case, you can deduct car expenses when going from job to job. You cannot deduct your commuting expenses (driving from your home to your first job location and from your last job location back to your residence).
Please click here for more details on car expenses.
