A team of Purdue University students devised a home heating fuel oil that is cheaper and burns cleaner than regular fuel oil, earning first place today (3/27) in the seventh annual New Uses for Soybeans Student Contest. Their soy heating oil mixes 20 percent soybean oil with regular fuel oil and can be used without making any changes to existing heating systems. The estimated cost of the blended oil is10 percent less than the cost of fuel oil alone.