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Diesel engines are inherently more efficient and although high
sulfur diesel fuel prohibited clean technologies that has changed
as refineries are now providing a cleaner fuel that opens up the
way for clean diesel engines.

Mercedes, Volkswagen and other manufacturers are now marketing
clean diesel engines.  It is time to stop prohibiting diesel
engines from being marketed in California.  

Diesel engines are well adapted to using biodiesel and vegetable
oil and as such are in the best position to help advance the best
biofuels.  Biofuels can be created using algae grown from sewage. 
A company in New Zealand is already producing bio fuels using this
technology.  A study conducted at the University of New Hampshire
a couple of years ago concluded that algae based bio fuels could
fuel the entire US transportation industry.

I drive a VW Jetta TDI and use 100% biodiesel made from recycled
vegetable oils that have previously been used in restaurants or
other food factories.  It required no modification to the engine
and burns much cleaner than petro diesel.  It can be mixed in any
ratio with petro diesel so it is easy to handle road trips where I
may not be able to find biodiesel.