Energy Minister Judith Collins says the Government will only intervene in the fuel market as a last resort if an inquiry into fuel pricing shows petrol companies are ripping off consumers.
Collins has begun an inquiry into the fuel industry after concern about rising margins between what fuel is imported and sold for.
Asked if the Government would intervene if the inquiry showed consumers were being ripped off, Collins said it would be reluctant to do so.
"You have to be very careful about that. It would be a last resort, and I don't think that's going to be necessary. I think having a bit of sunlight on the issue will help sort out the market pretty quickly."
She said there had already been a drop in margins of close to six per cent in the last week. "I've always said the best outcome would be that the margins dropped down without us having to do very much."