Rank the top three most efficient fuels?
Answer:
Any hydrocarbon fuel can be completely combusted to CO2 and water. The efficiency you speak of (I assume) is related to the apparatus used to burn and extract the energy. Hybrid autos get better mileage because they are able to recover engine energy used to accelerate the car during breaking. Benz is working on a prototype hybrid which captures exhaust gas heat, boils water to create steam which then powers a mini electric generating turbine.
IC engine power plants can boost efficiency by using the engine coolant to heat the building during winter months.
All of these examples are ultimately independent of the fuel used. Efficiency comes from being able to convert heat energy into mechanical energy, and there will always be losses in that conversion.
You mean for a car? Becuase the most efficient fuel we can find and use right now is uranium.
methane, CH4, burns very cleanly to produce CO2 and H2O, 100%
Gasoline internal combustion engines are 12% efficient
diesel internal combustion engines are 25% efficient.
water power, wind, solar may not be that efficient, but they are free and renewable and nonpolluting.
Biomass is a good source of energy whether we obtain gas or oil from it.
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