The plan, unveiled at the Liberal Democrat conference, is designed to provide immediate relief to motorists. The party said the temporary reduction in fuel duty would cost approximately £2bn.
The policy announcement comes as internal concern grows within Ed Davey's party that voters are not sufficiently aware of what the Liberal Democrats stand for. According to polling cited by the party, Liberal Democrat policies are less well known to the public than those of Restore Britain, a party that only launched in February and has just one MP, Rupert Lowe, compared to the Liberal Democrats' 71.
The fuel duty proposal is one of several policies being put forward at the conference aimed at boosting the party's recognisability and electoral appeal. The move reflects a strategic push to differentiate the Liberal Democrats from their larger rivals on a key cost-of-living issue.