Travelling allowance - how much should I reasonably expect considering the mileage is around 15-17?

ar-rock
From this month onwards I am asked by my employer to use my own car (Alto LXi 2005, petrol) for an official purpose (twice a month) . The monthly usage would be one journey of 350 + another of 200kms = 550kms. He has agreed to pay allowance for the same. how much should I reasonably expect considering the mileage is around 15-17? If I am offered lesser, will be giving an excuse to not take my vehicle.
PS: My present salary is 10000 per month ( pre and post covid) and does involve driving.
ar-rock
* sorry I meant does not involve driving.
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