Compare the fueling/charging costs and ghg emissions of an electric car, a hydrogen fuel cell car, and an ice (running on petrol) car per km of range by using the following assumptions: the high-pressure hydrogen is produced using a medimum pressure electrolyser with 0.65 efficiency followed by and an external compressor with 80% efficiency. the round-trip energy efficiency of the battery is 80% the battery is charged in a cold winter time in melbourne for which equivalent to 10% of the energy content of batteries is used for their thermal management during charging. 10% of the electrical energy stored in the battery is used by the heater (i. e. in a cold winter day). the energy content of hydrogen (hhv) is 142 mj/kg (~40 kwh/kg) the energy content of unleaded petrol is 34.2 mj/litre the overall efficiency of the petrol car in converting the chemical energy of the fuel to mechanical energy delivered to the wheels is 20% the average energy efficiency of the fuel cells used is 45% (based on hhv), and that of the electric motors 85% the batteries are charged up by using grid electricity in victoria the electrolyser and compressor are powered by electricity supplied by the victorian grid