brown gas
n.— «Besides saving gas money, using what is called “brown gas” makes the car drive smoother, cleans the engine and is better for the environment, Bogue said.…Under his hood, Bogue filled six quart-sized jars with water and baking soda, covered them with vacumn-sealed plastic lids, installed a charcoal filter and connected it all with tubes to the car’s air intake system.…Besides saving gas money, using what is called “brown gas” makes the car drive smoother, cleans the engine and is better for the environment, Bogue said.» —“Baking soda boosts mileage” by Karen McIntyre-dn Daily News (Red Bluff, California) May 7, 2008. (source: Double-Tongued Dictionary)
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Still a scam. It takes more energy to make the gas than it gives off when burning.