“Anyone can produce a 'what if' straight-line extrapolation of the future to justify the lost revenue argument. “And that is what the Treasury and successive Chancellors have done Budget after Budget to portray themselves as fiscal martyrs.” FairFuelUK sent a letter signed by 26 Tory MPs to the Chancellor last week demanding the duty was not increased. They warned any rise would “disproportionately impact” lower-paid workers outside of London. READ MORE They also hinted Prime Minister Boris Johnson had pledged to not raise the tax ahead of the 2019 General Election. A Treasury source said electric vehicle costs would be the “priority” in the budget instead of raising fuel duty costs.