Imagine that your car is powered by a fusion engine in which the following reaction occurs: 321H→42He + 11H + 10n. The masses are 21H (2.0141 u), 42He (4.0026 u), 11H (1.0078 u), and 10n (1.0087 u). The engine uses 6.1 × 10-6 kg of deuterium 21H fuel. If one gallon of gasoline produces 2.1 × 109 J of energy, how many gallons of gasoline would have to be burned to equal the energy released by all the deuterium fuel?