A University of Kansas petroleum engineer said she and her colleagues are poised to begin testing biodiesel that costs $1 a gallon.
Professor Susan Stagg-Williams said the fuel consists of used cooking oil, leftover methanol from chemistry researchers and potassium hydroxide — lye — from the hardware store.
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(The success of the biodiesel fuel industry relies heavily on biodiesel testing, not only at the production level but at the consumer level, where degraded fuel may cause engine failures.  Fleet Biodiesel's family of inexpensive biodiesel test kits is just a click away on the internet)