When asked why that’s the case, Bill Colton, ExxonMobil’s vice president for Corporate Strategic Planning, often starts the discussion using this fact to put it in perspective:

“All of the energy concentrated in one gallon of gasoline is enough to charge an iPhone once a day for almost 20 years.”

And that is why ExxonMobil predict that by 2040, about 90 percent of the global transportation fleet will still be powered by liquid petroleum fuels – that is, gasoline, diesel, and jet fuel.