In an ideal world, you’d probably want an extremely efficient gas and diesel generator, but they’re expensive, and you’re likely not getting the most efficient kind of gas for your power needs. The first thing to understand is that an oil refinery and its associated facilities need a fair bit of energy to stay running, as they require massive amounts of fossil fuel.
The second big source of energy needed to sustain an industry, which is quite different to energy used inside an oil refinery, is electricity. The amount of electricity needed per unit of oil, and per unit of electricity produced is pretty similar to how energy is used to drive electric engines: you’ll get more power out of the combustion engine when fuel is burned, so more energy is required to run the engine.
When you look at the different fuel types, you can look at how different energy densities affect the efficiency of your cars. An engine that uses about 12 kWh per kilowatt-hour (kWh/kW) is most efficient. An engine using 40 kWh/kWh produces the most power. We don’t really care about what gas you use for your car when calculating that. It all comes down to what you’re driving.
What happens when you’re driving out into the desert? Energy is needed just to keep up with the wind. The wind could be blowing 50, or even 250 miles per hour – it just doesn’t matter. If the car was running on oil instead, then it would be consuming more energy overall. But if you are driving on gas, then energy is consumed just to maintain that constant speed throughout the journey. In the case of a car that is using conventional engines without any significant emissions controls, the efficiency you’ll achieve is lower than if you’re running on fossil fuels.
The energy is still the same when you take a conventional automobile and add a battery. In an ideal world, when energy is stored up, the car is able to run on a regular basis. Battery energy for a typical electric car is about 1,000 kWh/mile and 5,700 Wh/mile (4,744 Wh/kWh/kW). So that’s 500 Wh for a mile, 2.1 kWh/mile for a full charge (including a full 24-hour charge), and 300 kWh/mile for full depleting. The maximum range of an electric car is just over 35 miles, so a battery will last for a long period of time.
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