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BMW’s prototype Turbosteamer technology converts 80 percent of the engine’s exhaust heat into power, boosting performance without using more gas. Mated to a 1.8-liter four-cylinder engine, it reduces fuel consumption by 15 percent while generating nearly 14 additional horsepower. The system heats fluid to 1,500ºF to form high-pressure steam that’s routed through a fan to help turn the engine crankshaft. The technology could arrive in BMWs within the decade. bmw.com
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