WetEV wrote: Didn't read the article on the Commons, did you?
I'm familiar with the work. But as to funding roads, gasoline tax has miniscule effect on miles driven or lifestyle decisions, because it pales in comparison to the price of the fuel itself and demand has proven to be relatively inelastic over wide price swings. Even less effective as a signal to control congestion since the effective tax rate varies widely due to variations in fuel economy.
Congestion pricing is a separate issue, and tends to reward the well-to-do.