0.14 per mile is the current standard allowable amount for charity. using mapquest miles is good too for support.
¶K-3615. Determining automobile expenses incurred in performing services to charities.
A taxpayer qualifying for a charitable deduction for the use of his automobile to provide charitable services ( ¶ K-3614) can determine the deductible amount by using a standard mileage rate (¶ K-3616) or actual expenses incurred (¶ K-3617). 33
A taxpayer claiming a deduction for the use of an automobile to provide services to a charitable organization must keep reliable written records of the deducted expenses. Generally, records that a taxpayer makes regularly and close to the time the taxpayer incurs the expenses are considered reliable. For each occasion the car is used for a charitable purpose, the taxpayer's records must show the date and the name of the charity the taxpayer was serving. If the standard mileage allowance is deducted, then the records must show the miles driven for the charitable purpose. If the actual expenses are deducted, then the records must show the costs of operating the automobile that are directly related to the charitable purpose. 34
RIA observation: The above IRS-prescribed rules apply the general substantiation requirements for automobiles (“listed property”) to the area of charitable services. For automobiles as listed property and the general substantiation requirements, see ¶ L-10002, and ¶ L-4601 et seq., respectively.
Taxpayer's mileage in connection with volunteer activities for a youth football cheerleading group was substantiated sufficiently via a printout of Mapquest directions detailing the miles driven to practices and games. The printout included the distance for each trip and number of trips taken. 34.1