Rumor has it the Top Gear crew will be burning up some of their homemade biodiesel brew at the upcoming Britcar 24-hour race at Silverstone, September 7th through 9th. Race entry records have Clarkson, the Hamster, James and the Stig entered in a diesel BMW 330 Dti Sport with a number 78 on it. Hilarity will no doubt ensue.
[Image courtesy of the discussion of this upcoming event from the Final Gear forums]