David over at Oikos posts an excellent overview of car efficiency standards in the US, and how they might apply in Australia. Café standards for cars: Espresso Excels and latte Lexuses.
Al Gore mentions efficiency standards in An Inconvenient Truth, and they are also referenced, from memory, in Who Killed the Electric Car. David’s piece gives a good overview (including the costs to manufacturers) and also suggests that such standards wouldn’t be as effective in Oz.
Update 26-Jan-2006: Martin Eberhard responds to the energy portion of Bush’s State of the Union speech with specific discussion of CAFE standards.