The reimbursement of mileage for the use of personal car on companies work is not calculated only on the basis of the price of petrol and the fuel consumption rate of the vehicle! It includes the amortised expenses on a/c of:
Price of petrol and 10-12 kms/litre for non AC usage and 8-10 kms/litre for AC ones.
Cost of normal wear and tear/Insurance/Road tax/driver salary(if entitled). For a senior management even the EMI on the car may be included.
The average at todays prices and rates the reimbursement per KM would be minimum Rs 10/-per km for non AC and Rs. 12/- per km for AC.
If you would hire a car you would be paying minimum Rs. 12/- per km for non AC(other than the usual battered Ambys/Indicas) and Rs. 15/- per km for an AC Indigo.
Trust this information would prove to be useful and I have given the rates applicable to a metro city like Mumba, Delhi, etc.
Regards,
UG