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Geothermal energy is heat energy from deep in the earth. Heat is brought to the near-surface by thermal conduction and by intrusion into the earth's crust of molten magma originating from great depth. Ground water is heated to form hydrothermal resources -- naturally occurring hot water and steam. Use of hydrothermal energy is economic today at a number of high-grade sites. Hydrothermal resources are tapped by existing well-drilling and energy-conversion technology to generate electricity or to produce hot water for direct use.

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CSU Engine Web Pages
http://www.engr.colostate.edu/~allan/engines.html
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Improve MPG: The Factors Affecting Fuel Economy
https://www.vnutz.com/articles/Improve_MPG_The_Factors_Affecting_Fuel_Efficiency
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