bt in the query itself, the petrol is mentioned, however for a two wheeler even upto 2500 petrol can be booked,
balance, towards taxi fare ( travelling exp), and other books and periodicals ( needed for research) ...claim upto 50% to 65% exp and then add the balance to taxable income
dont forget to pay profession tax as per the slab applicable under the state( if the profession tax is not deducted by the part time employer), or after sometime it will be a headache.