It's an industrial-strength irony — used restaurant fryer oil is valuable enough for environmentalist early-adopters to steal it from outdoor tanks to power their cars, but the companies that collect it and process it can't charge enough to make a profit.
Only two Connecticut companies produce biodiesel fuel commercially. Biodiesel, which has long generated interest in alternative-energy circles, is made from vegetable oil rather than petroleum, and can be used anywhere regular diesel is used — in vehicles' diesel engines or in home heating oil tanks.
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(The success of the biodiesel fuel industry relies heavily on biodiesel testing <http://www.youtube.com/watch?v=s32Ke2VzrqU>, not only at the production level but at the consumer level, where degraded fuel may cause engine failures.  Of major concern to diesel and biodiesel users is the very real possibility that water has contaminated their fuel. (See http://www.youtube.com/watch?v=0YcczdvPyAk).  The potential catastrophic impact of this problem is discussed at length  in this video at: http://www.youtube.com/watch?v=-lh4qhXc_5s&feature=youtube_gdata.
Fleet Fuel's  family of inexpensive biodiesel test kits  is just a click away on the internet at:
<http://fleetbiodiesel.com/biodiesel_testing_and_supplies.html>)