"Cutting excise tax on petrol would mean less money for [xxxx], Energy Minister Trevor Mallard says" on the Herald site.
Insert any words you like where I've put xxxx -- after all, Trevor does. And remember when you fill up your car that 47% of the cost, plus GST, goes straight to Michael, Trevor and Helen to piss up against an electoral wall. Steve Forbes has an idea where some of the rest of the cost increase comes from.
[UPATE 1: Links fixed.]
[UPDATE 2: Bush's agreement last night to release some of the US petroleum reserve fulfils one part of Forbes ' recommendation.]