The Labour Government is also keen to plug a £22 billion back hole in public finances.
Mr Cox made the assessment after Prime Minister Sir Keir Starmer warned the next Budget could be “painful”.
However, the campaigner admitted the move and a likely increase in fuel duty would “fleece” motorists across the country.
Howard commented: “The inevitable move to Big Brother pay-per-mile taxation, which Labour plans to work alongside the declining fuel duty income, will undoubtedly be announced in the budget too.
Although a detailed plan has never emerged, experts have previously guessed how much motorists could pay
The Campaign for Better Transport has recently predicted that a 2p per mile charge could be introduced.
However, the Resolution Foundation feels rates will be higher with officials suggesting a 6p per mile fee was more likely.
