Can i claim petrol allowance as an exemption

Hi friends

Please tell me that can i claim petrol ALLOWANCE as an exemption under SALARY headfrom incometax..Is there any fixed amount of exemption. if yes please give me any reference.

I had already claimed conveyance exemption, i want to claim one more exeption in my salary structue. Can u please help me to provide list of fixed exemption i can claim form the incom tax

Thank you