How much hydrogen does it take to equal the power of a gallon of gasoline?

One gallon of gasoline contains about 33.6 kilowatt-hours (kWh) of energy. To match this energy with hydrogen, approximately 1.4 kilograms of hydrogen would be needed, as hydrogen has an energy content of around 33.6 kWh per kilogram when burned. This means that, in terms of energy equivalence, about 1.4 kg of hydrogen can provide the same power as one gallon of gasoline.