In a couple of years, imagine pulling up to the pump and filling your tank with french fry grease, pond algae, soybeans, and cow fat. People are doing it now: read this cheeky but informative piece in MSN-Money for proof. But it should be even more accessible through conversion technology that Richard Shull and his Midland company are testing in their quest to create biodiesel.
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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://fleetfueltesting.com>)