The government will look "very carefully" at plans to increase fuel duty by 2p, Gordon Brown has said.
Appearing before the Commons liaison committee on Thursday, the prime minister said that other increases had not come into force.
"I think you will find that in most years since 2000 that the duty has actually been frozen," he told MPs.
He said that it was a decision for chancellor Alistair Darling to make, but added: "It is clearly a matter that will be looked at very, very carefully over the next few weeks."
The prime minister also pledged to do more to help low income families with domestic energy bills.
"If demand succeeds supply and is likely to exceed supply for years to come, people will expect the price to rise," he said.
"If we can take measures that will help people cut their energy bills by using energy more efficiently or finding a way that we can help them cut the consumption of energy we will do so," he said.
