I agree with a fairer system, the more you use the vehicle, the more you pay. Fuel is the easiest way to apply that... It would maybe encourage the creation of vehicles doing more mpg.
But most likely it would be a way for them to put the price of fuel up to a place where you simply can't afford to use it.
And for people living in a rural location it kind of penalises them, for example, if I want to visit a supermarket I have a 74 mile round trip, hospital the same, main hospital is a 200 mile round trip. I'm not complaining, I choose to live here, and it's one reason we do online shopping. But you see what I'm saying.
Taxation is a joke. What really grinds my gears is fuel, again, its taxed several times.. You pay tax on tax! That wants addressing before they add yet another tax to it.
In short, I agree with the idea, but let's have everything taxed the same. Be it a bike or a jumbo jet.