How did you arrive at 0.4 kWh of energy per 95 grams of CO2?

Back of the envelope calculations. 95 grams of CO2 is equal to 2 moles of CO2. Assuming complete combustion of Propane that is two moles of propane as well. Calorific value of propane is 2,200 kJ per mol. That turns out to be total energy output of 4,400 kJ per kilometer or 1.2 kWh. Which continuing with your line of thinking is 144 kW of power at 120km/h. This places an upper theoretical limit exceeding 110kW. Not saying this says anything about the actual burning characteristics of gasoline, just that the theoretical limit is higher.