Trucks and Buss are excluded from the standard mileage deduction. However,
you can still claim expenses tied to the use of your truck such as; Gas,
maintenance (oil change, tires,
cleaning etc.), anything you have to pay in order to maintain your truck
and keep it
running. If you are a truck owner operator, you can also include;
Insurance
Interest Payments
Leasing fees
Depreciation
You would want to use the actual method, (as there is no standard
mileage method for a bus) because it costs you a lot to drive a bus in
the cost of the bus (depreciation taken of this) the fuel, repairs,
maintenance etc, which would be much larger than the cost of driving an
auto or pickup.