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The future of fuel-to-energy efficiency is bright! Thermoelectrics could help capture more energy from waste heat and things like solid oxide fuel cells or companies like Lightcell energy might squeeze more energy out of fuels.

https://en.wikipedia.org/wiki/Thermoelectric_generator

https://en.wikipedia.org/wiki/Solid_oxide_fuel_cell

https://www.lightcellenergy.com/

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