“Optional standard mileage rates for use of a vehicle will go down by one-half cent per mile for 2014, the IRS announced on Friday. Taxpayers can use the optional standard mileage rates to calculate the deductible costs of operating an automobile. For business use of a car, van, pickup truck, or panel truck, the 2014 rate will be 56 cents per mile. Driving for medical or moving purposes may be deducted at 23.5 cents per mile. Both rates are one-half cent lower than for 2013.”