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Most importantly, the material is most effective between 450 and 950° Fahrenheit. This is a typical temperature range for many power systems, including car engines. Many experts argue that up to 60 percent of a gasoline engine’s energy is lost through waste heat, so a thermoelectric device using lead telluride would be a welcome addition to any car. Such devices have no moving parts; this means that wear and tear is virtually non-existent.