When it is burned, 1 gallon of gasoline produces 1.3×108J of energy. 1400 kg car accelerates from rest to 40 m/s in 10 s. The engine of this car is only 15% efficient (which is typical), meaning that only 15% of the energy from the combustion of the gasoline is used to accelerate the car. The rest goes into things like the internal kinetic energy of the engine parts as well as heating of the exhaust air and engine.