You’re enthusiastic about fusion energy, and you want to convince others of the enormous fuel resource represented by the 0.015% of hydrogen nuclei that are actually deuterium. Using an average of 7.2 MeV per deuteron, you calculate the energy that would be released if all the deuterium in a gallon of seawater underwent fusion, and you compare your result with the energy in a gallon of gasoline. What do you find for the gasoline equivalent of a gallon of seawater?