The density of petrol should be within a specific range. According to the Bureau of Indian Standards (BIS) specification IS 2796, the density of petrol should be within the range of 720-775 kg/m3. The government has also set the standard range of density for petrol to be 730-770 kg/m3 in India. It is important to ensure that the fuel is of high quality and clean, and that the density is within the specified range to ensure optimal fuel economy and performance of the vehicle. If the density of petrol is outside the specified range, it is advisable not to get fuel filled from that petrol pump.