Look at it from an economics standpoint... because of the efficiency loss, energy from this process would always be twice as expensive (or more) than freshly ge

Look at it from an economics standpoint... because of the efficiency loss, energy from this process would always be twice as expensive (or more) than freshly generated renewable electricity. So you'd only want to use it in places where grid electricity is impractical. Vehicles are the obvious market. It took over a century for electric vehicles to become even remotely practical. But vehicles are necessarily disconnected from the grid. And even for vehicles, this is only desirable when consumption needs or disconnect times are very high, like aircraft and oceangoing ships. That's because combustion is very wasteful. There are about 33.7 kwh of energy in a gallon of gasoline. A Tesla goes as far on three gallons' worth of energy as a comparable Mercedes goes in ten or more. That's because an electric drivetrain is 3x (or more) more efficient than a combustion one. So using this process, it could cost 10x as much to operate a fuel-based vehicle as an electric one. You don't want to do that unless you have no other choice.