First, Subaru's diesel goes on sale in Europe in February and gets an average of 40mpg:
First Drive:Subaru Legacy diesel (2008 onwards model)
Subaru’s First Boxer Diesel Passenger Cars: Legacy Sports Tourer and Outback
the Outback (with fuel consumption of 5.8 L/100km, or 40.6 mpg US) is only slightly behind at 124 mph and 8.8 seconds for the 0-60 mph dash.
And algal biodiesel has been tested successfully and is ready for commercialization:
Solazyme Introduces Its First Algal Biodiesel, Enters Development Agreement With Chevron
