The problem for Reeves with fuel duty is cars are more economical these days and we have electric cars. I suspect she’ll be more tempted to look at pay per mile. Given the unfair nature of fuel duty (you pay tax on tax) I’d like to see a much fairer system where we pay a fixed cost to register your car each year (around £500) with a pay per mile on main roads and remove fuel duty entirely. Obviously HGVs and the such would have some other fixed cost and potentially per mile rate to pay.
It’ll be far simpler to implement and far more transparent- I suspect it will make people question if they need to travel far more than the current model as it’s much clearer how much each mile costs.