If you use your car for deductible moving or medical purposes, you can add the cost of driving based on a standard mileage rate. For 2008, the rate is 19
Advance payment of current tax liability based either on wage withholdings or installment payments of your estimated tax liability. To avoid penalties, you generally must pay to the IRS either 90% of your final tax liability, or either 100% or 110% of the prior year’s tax liability, depending on your adjusted gross income.